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': 'Drug given to reduce uterine contractions during preterm labour with least side effects : \nSelect and explain. \nA. Ritodrine, B. Nifidipine, C. Magnessium sulphate, D. Progesterone', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is b i.e. Nifedipine', 'role': 'assistant'}]