This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
[{'content': "Kerley B lines' in the chestX-ray of a patient is a radiological feature of- \nSelect and explain. \nA. Respiratory failure, B. Mitral regurgitation, C. Renal failure, D. Liver failure", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Chest X-ray findings of MR: The LA and LV are the dominant chambers in chronic MR. Late in the course of the disease, the LA may be massively enlarged and forms the right border of the cardiac silhouette. Pulmonary venous congestion, interstitial edema, and Kerley B lines are sometimes noted. ref : Harrison&;s principle of internal medicine,20th edition,pg no. 1935', 'role': 'assistant'}]