This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System, Subject name: Radiology
[{'content': 'Not true regarding Pectus excavatum? \nSelect and explain. \nA. Heart shifted towards left side, B. Features may suggest RML consolidation, C. Anterior ribs are more vertically oriented - 7 shaped ribs, D. Heart shifted towards right side.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans DIn pectus excavatum the heart is shifted towards left side. As right heart border goes behind the sternum it is obscured and can thus mimic right middle lobe disease.', 'role': 'assistant'}]