This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
[{'content': 'Cervix contains \nSelect and explain. \nA. Mainly muscle fibres, B. Mainly collagen, C. Both muscle and collagen are in equal proportion, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Cervix contains mainly collagen and only 10 % of muscle fibres.', 'role': 'assistant'}]