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': 'Which is the baseline investigation in the case of an acute abdomen in this high - tech era - \nSelect and explain. \nA. Abdomen CT, B. Abdomen X - Ray, C. USG, D. Colonoscopy', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Abdomen X-Ray", 'role': 'assistant'}]