This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Anatomy
[{'content': 'A patient developed breathlessness and chest pain, on second postoperative day after a total hip replacement. Echo-cardiography showed right ventricular dilatation and tricuspid regurgitation. What is the most likely diagnosis- \nSelect and explain. \nA. Acute MI, B. Pulmonary embolism, C. Hypotensive shock, D. Cardiac tamponate', 'role': 'user'}, {'content': "Answer: B \nExplanation: *Onset of chest pain and breathlessness, together with echocardiographic evidence of right ventricular dilatation and tricispid regurgitation after a high risk procedure like total hip replacement suggests a diagnosis of pulmonary embolism. REF:Campbell's 11th/e Chapter-7", 'role': 'assistant'}]