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': 'Braxton -- Hicks contractions : \nSelect and explain. \nA. Is a positive feedback system, B. Is another terms for labor contraction, C. Occur during most of the months of pregnancy, D. Result in hypoxia of the fetus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Occur during most of the months of pregnancy', 'role': 'assistant'}]