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': 'Most sensitive test for acute fetal distress : \nSelect and explain. \nA. Fresh meconium on induction of labour, B. Loss of beat to beat variation of hea beat, C. Increased fetal movements, D. Type 1 dips in second stage', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Loss of beat to beat variation of hea beat', 'role': 'assistant'}]