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: Anatomy
[{'content': "Which chamber's anterior wall forms most of the sternocostal surface of the hea? \nSelect and explain. \nA. Left atrium, B. Left ventricle, C. Right atrium, D. Right ventricle", 'role': 'user'}, {'content': 'Answer: D \nExplanation: The hea has three impoant surfaces: an anterior surface, a diaphragmatic surface, and a pulmonary surface. The anterior surface, or sternocostal surface, is mostly made up of the right ventricle. The diaphragmatic surface is mostly the left ventricle, but a little bit of the right ventricle sits on the diaphragm as well. Finally, the pulmonary surface, which is on the left, is mostly made up of the left ventricle.', 'role': 'assistant'}]