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': 'In Primi, in Preterm Labour, which of the following can be used as Tocolytic a) Ritodrineb) MgSo4c) Dexamethasoned) Propranolol \nSelect and explain. \nA. ac, B. ab, C. ad, D. bc', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Tocolytics are drugs to arrest preterm labor.\nIn case of preterm labor main problem is lungs of the fetus are not mature so the main treatment is antenatal steroid injection to the mother ,but steroids require a minimum waiting period of 24 hours to act, so in the meanwhile tocolytics are given to arrest uterine contractions.\nDrugs with tocolytic effect but poor efficacy:\n\nEthyl alcohol\n\nKDT 6/e, p 319\n\nNitrites\nAtropine\nPhenothiazine\nGeneral anaesthetics', 'role': 'assistant'}]