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: Biochemistry
[{'content': 'Which of the following porphyrin is soluble in water & excreted in urine?a) Protoporphyrinb) Delta-ALAc) Coproporphyrind) Uroporphyrin \nSelect and explain. \nA. abc, B. acd, C. cd, D. ad', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Uroporphyrin, the most water-soluble of the porphyrins, is excreted predominantly in urine, coproporphyrin mostly in urine and partly in bile, whereas protoporphyrin, the least soluble, is excreted only in the bile.', 'role': 'assistant'}]