Who in a sentence

I think also that the probability is in favour of his being a country practitioner who does a great deal of his visiting on foot.
Arthur Conan Doyle, The Hound of Baskervilles

“I think,” said I, following as far as I could the methods of my companion, “that Dr. Mortimer is a successful, elderly medical man, well-esteemed since those who know him give him this mark of their appreciation.”
Arthur Conan Doyle, The Hound of Baskervilles

Mr. Sherlock Holmes, who was usually very late in the mornings, save upon those not infrequent occasions when he was up all night, was seated at the breakfast table.
Arthur Conan Doyle, The Hound of Baskervilles

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Dictionary

Merriam-Webster
— what or which person or persons —used as an interrogative
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Macmillan
— used for asking which person is involved in something, or what someone’s name is
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Usage

150 uses of ‘who’ in The Hound of the Baskervilles, by Arthur Conan Doyle