Answer

Answer is a versatile command, used very often. The help file instructs that it's used to answer quest questions, but it does a lot more than that–a form of that even is (was?) used to answer a botcheck. It's used to initiate quests, or pick up a quest affect, like in Ruushi's invasion; can be used to direct crafting mobs; or even to answer simple quest questions, like those found in Mejath.

From "help answer:"

Answer:

Usage: answer <string>

The answer command is used specifically to answer quest questions. When 
prompted by Nodeka for quests, use the answer command to respond.

For more information, see: help quest open, help quest completed, help check