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[ { "question": "What is the value of x in 2x + 5 = 15?", "optionA": "3", "optionB": "5", "optionC": "8", "optionD": "10", "answer": "B", "explanation": "2x = 15 - 5 = 10, so x = 5", "difficulty": "medium" }, { "question": "Who wrote 'Things Fall Apart'?", "optionA": "Wole Soyinka", "optionB": "Chinua Achebe", "optionC": "Chimamanda Adichie", "optionD": "Buchi Emecheta", "answer": "B", "explanation": "Chinua Achebe published Things Fall Apart in 1958.", "difficulty": "medium" }, { "question": "Which organelle is known as the powerhouse of the cell?", "optionA": "Nucleus", "optionB": "Mitochondria", "optionC": "Ribosome", "optionD": "Golgi apparatus", "answer": "B", "explanation": "Mitochondria produce ATP, the cell's energy currency.", "difficulty": "easy" } ]

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