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': 'Metabolites of tryptophan can give rise to \nSelect and explain. \nA. Diarrhoea, B. Vasoconstriction, C. Flushing, D. All of these', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Serotonin (a metabolite of tryptophan) causes vasoconstriction, flushing, chronic diarrhea and respiratory distress due to bronchospasm.\nAlbinism is a defect in the metabolism of tyrosine due to deficiency of tyrosinase.', 'role': 'assistant'}]