The adjective “irrelevant” normally takes the preposition “to.” Therefore, the grammatically correct expression is “irrelevant to the topic,” meaning something is unrelated or not important to the subject being discussed.
The matter is irrelevant ______ the topic for discussion.
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the PPSC Punjab Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.