Select the most appropriate option to fill in the blank.
He is the patient ______ called you in the morning.

Correct option is C

The correct option to fill in the blank is (c) who.
Explanation:
· "Who" is used as a relative pronoun for a subject (a person performing the action).
· The clause " who called you in the morning" refers to "the patient" (subject).
· "Whom" is used when referring to an object (not applicable here).
· "Which" is used for non-human things, and "that" is less preferred in defining human subjects.
Correct sentence: He is the patient who called you in the morning.
Example:
· Incorrect: She is the girl which helped me.
· Correct: She is the girl who helped me.
Meanings of all the other options:
· Which – Used for objects or animals. (जो)
· Whom – Used for the object of the sentence. (जिसे)
· That – Can refer to both people and things but is less formal than "who". (जो)