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': 'X-ray findings in cardiac failure are all of the following except: \nSelect and explain. \nA. Kerley B lines, B. Pleural effusion, C. Prominent lower lobe veins, D. Cardiomegaly', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Prominent lower lobe veins', 'role': 'assistant'}]