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: Medicine
[{'content': "Loud pulmonary component of second heart sound heard in  a) Pulmonary hypertension  b) TOF  c) Eissenmenger's syndrome  d) Pulmonary stenosis  e) AS \nSelect and explain. \nA. ac, B. bc, C. cd, D. bd", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]