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: Medicine
[{'content': 'Reversed splitting of second hea sound is seen in all of the following except \nSelect and explain. \nA. Aoic stenosis, B. Left bundle branch block, C. Atrial septal defect, D. Systemic hypeension', 'role': 'user'}, {'content': "Answer: C \nExplanation: Causes of Fixed (wide) splitASD (Most characteristic cause for wide fixed splitting)Pulmonic StenosisAcute Right Hea Failure (Pulmonary Embolism)Refer: Harrison's Principles of Internal Medicine, 18th edition, pg no: 1921-1923", 'role': 'assistant'}]