[{"id": 1, "type": "multiple_choice", "options": ["O₂", "CO₂", "H₂O", "NaCl"], "question": "What is the chemical symbol for water?", "correct_answer": "H₂O"}, {"id": 2, "type": "multiple_choice", "options": ["Nucleus", "Mitochondria", "Cell membrane", "Ribosome"], "question": "What organelle is known as the \"powerhouse of the cell\"?", "correct_answer": "Mitochondria"}, {"id": 3, "type": "multiple_choice", "options": ["Ribosome", "Cell membrane", "Mitochondria", "Nucleus"], "question": "What organelle is known as the \"powerhouse of the cell\"?", "correct_answer": "Mitochondria"}, {"id": 4, "type": "multiple_choice", "options": ["Ribosome", "Mitochondria", "Cell membrane", "Nucleus"], "question": "What organelle is known as the \"powerhouse of the cell\"?", "correct_answer": "Mitochondria"}, {"id": 5, "type": "multiple_choice", "options": ["CO₂", "NaCl", "H₂O", "O₂"], "question": "What is the chemical symbol for water?", "correct_answer": "H₂O"}]