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': 'Barbiturate precipitates symptoms of porphyria\nbecause \nSelect and explain. \nA. they induce ALA synthase, B. they inhibit ALA synthase, C. they induce heme oxygenase, D. they inhibit heme oxygenase', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]