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': "All of the following signs are not seen in acute appendicitis except - \nSelect and explain. \nA. Rovsing' s, B. Murphy's sign, C. Boa's sign, D. Mack wen's sign", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]