Usually, the question would sound more like "Is he/she a doctor?" or "He/she is a doctor, isn't he/she?", to which you could reply "Yes, he/she is a doctor" or "Yes, he/she was a doctor". If, however, the question was "Is that a doctor?", you could reply with "Yes, that's a doctor". So to answer your question, your answer should usually contain the same pronoun as the question. If someone asks about "he/she", you reply with "he/she". If they ask about "it", you reply with "it" Hope this helps!

is he a doctor? Is she a doctor? yes he is a doctor, yes she is a doctor (all ok) who is that? that is the doctor. That is Tom. It's the doctor, it's Tom (all are ok) "Is that a doctor" sounds a little strange; grammatically correct but strange. Better: Is that the doctor? Is he/she a doctor?

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