[{"id": 1, "type": "multiple_choice", "options": ["O₂", "H₂O", "CO₂", "NaCl"], "question": "What is the chemical symbol for water?", "correct_answer": "H₂O"}, {"id": 2, "type": "multiple_choice", "options": ["O₂", "NaCl", "H₂O", "CO₂"], "question": "What is the chemical symbol for water?", "correct_answer": "H₂O"}, {"id": 3, "type": "multiple_choice", "options": ["NaCl", "CO₂", "O₂", "H₂O"], "question": "What is the chemical symbol for water?", "correct_answer": "H₂O"}, {"id": 4, "type": "multiple_choice", "options": ["NaCl", "O₂", "CO₂", "H₂O"], "question": "What is the chemical symbol for water?", "correct_answer": "H₂O"}, {"id": 5, "type": "multiple_choice", "options": ["H₂O", "O₂", "NaCl", "CO₂"], "question": "What is the chemical symbol for water?", "correct_answer": "H₂O"}]