Question: what is the difference between who and whom in adjective clause?
Answer: Rule #1: Substitute “he/him” or “she/her”: If it's either “he” or “she,” then it's “who;” if it's “him” or “her,” then it's “whom.” “he” (whoever) is the subject of the verb “called.” In the sentence, “Give it to whoever deserves it”:([You] give it to whoever deserves it.)