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': 'Nicoladoni branham sign is ? \nSelect and explain. \nA. Compression cause bradycardia, B. Compression cause tachycardia, C. Hypotension, D. Systolic filling', 'role': 'user'}, {'content': "Answer: A \nExplanation: Answer is 'a' i.e. Compression cause bradycardia", 'role': 'assistant'}]