Question

why did you respond the way you did ?​

Answer 1

Answer:

The correct response anywhere but in Britain or the former British colonies* is "Fine, thank you. How do you do?" (Or "Fine, thank you. And you?") It is not socially acceptable to answer this question with "the truth." If you are not feeling well or if you are ill, you should not go into the details of what ails you, because this occasion is a social formality, like shaking hands, and is not a verbal questionnaire.