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': 'pH of amniotic fluid at later weeks of gestation : \nSelect and explain. \nA. 4.5, B. 6.5, C. 7, D. 7.2', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 7.2', 'role': 'assistant'}]