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