Answer – la respuesta
To remember that answer is pronounced res-pwehs-tah (respuesta) in Spanish, use the following mnemonic:
"Answer when I speak to you!" said the king as he tried to get his new parrot to talk. Its response was to poo on the court jester (respuesta).
Respuesta is feminine, so it's la respuesta. Imagine a lady giving her answer to an unattractive man who proposes to her.