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': 'Contraction stress test is used to detect : \nSelect and explain. \nA. Fetal hypoxia, B. Placenta pre, C. Hydramnios, D. Cord prolapse', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Fetal hypoxia', 'role': 'assistant'}]