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': 'Earliest symptoms in acute appendicitis is ? \nSelect and explain. \nA. Pain, B. Fever, C. Vomiting, D. Rise of pulse rate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is \'a\' i.e., Pain Schwaz writes - In more than 95% of patients with acute appendicitis, anorexia is the first symptom, followed by abdominal pain, which is followed in turn, by vomiting (if vomiting occurs). If vomiting precedes the onset of pain, the diagnosis of appendicitis should be questioned".', 'role': 'assistant'}]