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: Physiology
[{'content': 'CVP denotes pressure of: September 2005 \nSelect and explain. \nA. Left ventricle, B. Left atrium, C. Right ventricle, D. Right atrium', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D: Right atriumCentral venous pressure denotes pressure in the great veins at their entrance into the right atrium and averages 4.6 mm Hg.Pressure in larger veins outside thorax:5.5 mm Hg Pressure in the venules:12-18 mm Hg', 'role': 'assistant'}]