I am learning English, so can I say?

When I pointing someone who I don't know, can I use "It" to answer the following questions: - Is that a doctor? -> Yes, it is. / Yes, it is a doctor. - That is a doctor, isn't it? -> No, it isn't. / No, it is a doctor. - Is that Tom? -> Yes, it is. / Yes, it is Tom. - That is Tom,... show more When I pointing someone who I don't know, can I use "It" to answer the following questions:
- Is that a doctor? -> Yes, it is. / Yes, it is a doctor.
- That is a doctor, isn't it? -> No, it isn't. / No, it is a doctor.

- Is that Tom? -> Yes, it is. / Yes, it is Tom.
- That is Tom, isn't it? -> No, it isn't. / No, it is Tom.
- Who is that? -> It's Tom.

- Is that your friend? -> Yes, it is. / Yes, it is my friend.
- That is your friend, isn't it? -> No, it isn't. / No, it is my friend.
- Who is that? -> It's my friend.

Thanks!
Update: - That is a doctor, isn't it? -> No, it isn't. / No, it is not a doctor.
- That is Tom, isn't it? -> No, it isn't. / No, it is not Tom.
- That is your friend, isn't it? -> No, it isn't. / No, it is not my friend.
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