Generate Quiz Questions on Any Topic

Generate [NUMBER] quiz questions on the topic of [TOPIC] for [AUDIENCE, e.g. university students / corporate trainees / high schoolers]. For each question: write the question, provide 4 multiple choice options (A, B, C, D), mark the correct answer, and add a one-sentence explanation of why that answer is correct. Mix difficulty levels: include [X] easy, [Y] medium, and [Z] hard questions.

Format as a clean, numbered list.