[{"id": 1, "type": "multiple_choice", "options": ["Hard, soft, medium", "Large, small, tiny", "Red, gray, black", "Igneous, sedimentary, metamorphic"], "question": "What are the three types of rocks?", "correct_answer": "Igneous, sedimentary, metamorphic"}, {"id": 2, "type": "written_response", "question": "Explain the scientific concept covered in \"Immune System Practice\" and provide a real-world example.", "correct_answer": null}, {"id": 3, "type": "true_false", "question": "The scientific method always begins with making an observation or asking a question.", "correct_answer": "True"}, {"id": 4, "type": "multiple_choice", "options": ["Nucleus", "Ribosome", "Cell membrane", "Mitochondria"], "question": "What organelle is known as the \"powerhouse of the cell\"?", "correct_answer": "Mitochondria"}, {"id": 5, "type": "multiple_choice", "options": ["Cell membrane", "Mitochondria", "Ribosome", "Nucleus"], "question": "What organelle is known as the \"powerhouse of the cell\"?", "correct_answer": "Mitochondria"}]