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': 'Post term labor is seen in : \nSelect and explain. \nA. Hydramnios, B. PID, C. Anencephaly, D. Multiple pregnancy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Anencephaly', 'role': 'assistant'}]