This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Venous Disorders, Subject name: Surgery
[{'content': "Harvey's sign is:- \nSelect and explain. \nA. Transmitted pressure wave on coughing in a various vein, B. Related to the use of venous filling after emptying a length of vein, C. Loss of hairs from eyebrows, D. None of the above", 'role': 'user'}, {'content': "Answer: B \nExplanation: Harvey's sign Related to the use of venous filling after emptying a length of vein Delayed venous refilling is called Harvey's sign", 'role': 'assistant'}]