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: Radiology
[{'content': 'Nephrogram phase of IVP is because of dye in: \nSelect and explain. \nA. Proximal convoluted tubules, B. Renal pelvis, C. Nephron, D. Collecting tubules', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Proximal convoluted tubules', 'role': 'assistant'}]