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: Unknown
[{'content': 'Commonest site of Morgagni hernia \nSelect and explain. \nA. Right anterior, B. Right posterior, C. Right anterior, D. Left posterior', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Morgagni hernias are related to maldevelopment of the embryologic septum transversum and to failed fusion of the sternal and costal fibrotendinous elements of the diaphragm. These hernias are generally asymptomatic and usually detected as incidental findings on radiographs.', 'role': 'assistant'}]