
die Reaktion
reaction
A response, behavior, or statement that occurs as a result of a specific action, event, or stimulus.
Ihre Reaktion auf die Kritik war sehr professionell.
Her reaction to the criticism was very professional.
reaction
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reaction
A response, behavior, or statement that occurs as a result of a specific action, event, or stimulus.
Ihre Reaktion auf die Kritik war sehr professionell.
Her reaction to the criticism was very professional.

reaction
The way the body responds to an external or internal stimulus, such as a medication or an allergen.
Nach dem Insektenstich zeigte sich eine starke allergische Reaktion auf der Haut.
After the insect bite, a strong allergic reaction appeared on the skin.

reaction
A chemical or physical process in which one or more substances are transformed into other substances.
Bei dieser chemischen Reaktion wird viel Wärme freigesetzt.
A lot of heat is released in this chemical reaction.

reaction
A political movement that opposes social progress and wants to restore earlier conditions considered conservative.
Nach der Revolution versuchte die monarchistische Reaktion, die alte Ordnung wiederherzustellen.
After the revolution, the monarchist reaction tried to restore the old order.
The noun 'die Reaktion' (reaction) is derived directly from the verb 'reagieren' (to react). When someone or something 'reagiert' (reacts), the result or consequence is a 'Reaktion' (reaction).
Der Körper reagiert auf das Virus mit Fieber. Diese Reaktion ist normal.
The body reacts to the virus with a fever. This reaction is normal.
'Reaktion' is almost always used with the preposition 'auf' followed by the accusative. It describes what is being reacted to.
Was war seine Reaktion auf die Nachricht?
What was his reaction to the news?
In general usage, 'Reaktion' is often combined with verbs such as 'zeigen' (to show), 'hervorrufen' (to cause/provoke), or 'auslösen' (to trigger).
Er zeigte keine Reaktion auf meine Frage.
He showed no reaction to my question.
In a medical context, you can recognize this meaning from words such as 'allergisch' (allergic), 'körperlich' (physical), 'Haut' (skin), or from the mention of medications and illnesses.
Eine allergische Reaktion auf Nüsse kann sehr gefährlich sein.
An allergic reaction to nuts can be very dangerous.
This meaning is technical and belongs to the field of chemistry or physics. You can recognize it from words such as 'chemisch' (chemical), 'Stoff' (substance), 'Energie' (energy), or 'Molekül' (molecule).
Die chemische Reaktion von Säure und Metall erzeugt Wasserstoff.
The chemical reaction between acid and metal produces hydrogen.
answer
Antwort and Reaktion can both follow a question or criticism. Antwort specifically means a content-based reply, while Reaktion can also be behavior, a feeling, or a statement that is not actually an answer. Antwort fits a factual reply, while Reaktion is more suitable for other behavior.

Auf die Kritik reagierte sie nur mit einem Lächeln.
She reacted to the criticism with nothing more than a smile.
Auf die Kritik gab sie eine sachliche Antwort.
She gave a factual response to the criticism.