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: Radiology
[{'content': 'Most common presentation of radiation carditis is : \nSelect and explain. \nA. Pyogenic Pericarditis, B. Pericardial Effusion, C. Myocardial Fibrosis, D. Atheromatous Plaque', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Pericardial Effusion Asymptomatic Pericardial effusionQ is the most common presentation of radiation carditis which is best diagnosed by EchocardiographyQ Radiation exposure may also cause acute pericarditis which presents as chest pain, fever, with or without pericardial effusion.', 'role': 'assistant'}]