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2 answers from the list are possile:

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- Кто он?

- Он аналитик. / – Он студент.

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Normally the question “Кто вы?” implies information about person’s profession or occupation and in many situations is equal to the question “Кто вы по профессии?” So, possible answers are “аналитик” (analyst), “студент” (student). The variants “Антон”, “мой брат” (my brother) could be answers for the question “Кто это?”. This question is very wide and doesn’t require any special information about a person.

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