If you answer a question with lots and lots and lots and lots of information, and can indicate a number of things:

• You know a lot about the substance
• You are insecure
• You don't really know the answer and try to talk around it
• You will be difficult to work with because it is hard to interrupt you and engage in a dialogue
• You did not understand the question fully and try to make sure to answer any related question

Better to answer that question short and to the point.

Art: Joseph Ducreux, Self Portrait, 1783