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: Pharmacology
[{'content': 'Which of the following anaesthetic produces best uterine relaxation? \nSelect and explain. \nA. Nitrous oxide, B. Halothane, C. Chloroform, D. Ether', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Halothane is the anaesthesia of choice for internal version and manual removal of placenta.\nHalothane\xa0\nPharyngeal and laryngeal reflexes are abolished early and coughing is suppressed,\xa0while bronchi dilate. As such, halothane is the preferred anaesthetic\xa0for\xa0asthmatics. It inhibits intestinal and uterine contractions. This property is utilized for facilitating external or internal version during late pregnancy. However, its use during labour can\xa0prolong delivery and increase postpartum blood loss.\xa0\nReference: Essentials of Medical Pharmacology Eighth Edition KD\xa0 TRIPATHI\xa0 page no 406', 'role': 'assistant'}]