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: Medicine
[{'content': 'Upturned Moustache sign or Antler sign is seen in \nSelect and explain. \nA. Mitral regurgitation, B. Aortic stenosis, C. Aortic regurgitation, D. Mitral stenosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Mitral stenosis leads to increased left atrial and hence pulmonary venous pressures. The prominence of pulmonary veins on chest X-rays leads to\xa0Upturned Moustache sign or Antler sign.', 'role': 'assistant'}]