This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
[{'content': "McConnell's sign in echo-cardiography is seen in \nSelect and explain. \nA. MI, B. Pulmonary embolism, C. Sarcoidosis, D. HOCM", 'role': 'user'}, {'content': "Answer: B \nExplanation: McConnell's sign is a distinct echocardiographic feature of acute massive pulmonary embolism. It is defined as a regional pattern of right ventricular dysfunction, with akinesia of the mid free wall and hyper contractility of the apical wall. Ref ganong's review of medical physiology 25e p753", 'role': 'assistant'}]