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': 'Cervlx develops from : \nSelect and explain. \nA. Wolffian duct, B. Mullerian duct, C. Mesonephros, D. Metanephros', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Mullerian duct', 'role': 'assistant'}]