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: Surgery
[{'content': 'Lower oesophageal sphinter is relaxed by -a) Alcoholb) Caffeine / Tea c) Diazepamd) Antacid \nSelect and explain. \nA. ab, B. bc, C. acd, D. abc', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]