The sentence should read: "Mr. Patel, who is the chairman of the department, came to me yesterday." "Who" is the correct choice because it is a subject pronoun and refers to Mr. Patel, who is performing the action of "being the chairman" within the relative clause. "Whom" is an object pronoun, and "which" is used for things or animals, not people.
Mr. Patel, ____ is the chairman of the department, came to me yesterday.
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the ETEA Educational Testing and Evaluation Agency preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.