—Is Mr. Black a successful businessman? —Yes, he is a _mind__ and he set up his own company by himself. A. brain B. helpful man C. smart person

I think both A and C can replace "mind". they can both mean "intelligent person"

  • Welcome to the community, I hope you can find the answer to all of your questions here. Before asking a question it would be a good idea to do some research first, and share it with people here so that they can better help you find an answer to your question . Check out sources like, dictionaries, Google Ngram and credible Grammar websites. – Fermichem Mar 21 at 7:58

Yes you can use it that way. This dictionary describes the use as "informal"
American Heritage Dictionary "brain" 3c

The word "mind" itself wouldn't be used as it is in the test question. One can describe a person as "a great mind", but not as just "a mind". There's no reason other than established usage.

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  • many thanks for helping with this. Got it. – Shelley shi Mar 21 at 6:21

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