This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
[{'content': 'Confirmation of appendicitis \nSelect and explain. \nA. Clinical examination, B. USG abdomen, C. X-ray abdomen, D. Raised TLC\\/DLC', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The classical features of acute appendicitis begin with poorly localised colicky abdominal pain.Central abdominal pain is associated with anorexia, nausea and usually one or two episodes of vomiting that follow the onset of pain (Murphy). Anorexia is a useful and constant clinical feature, paicularly in children. The patient often gives a history of similar discomfo that settled spontaneously. Ref: Bailey & Love&;s Sho Practice of Surgery,E25,Page-1207,1208', 'role': 'assistant'}]