How to Say "answer for" in Spanish
The Spanish word for “answer for” is “responder” — B1 level. This is a very common word in everyday Spanish.

Examples
El paciente no responde al tratamiento.
The patient is not responding to the treatment.
La empresa debe responder por los daños causados.
The company must be responsible for the damages caused.
Mi coche viejo ya no responde bien en las subidas.
My old car doesn't perform well on hills anymore.
Responder POR (Responsibility)
When 'responder' means 'to be responsible for something,' it must be followed by the preposition 'por': 'Tú respondes por el equipo' (You are responsible for the team).
Using it for Emotional Reaction
Mistake: “Using 'Respondí con tristeza' (I responded with sadness).”
Correction: For emotional reaction, use 'Reaccioné' or 'Contesté'. 'Responder' usually implies a physical or functional reaction, or a formal answer.
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