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
Barbiturate precipitates symptoms of porphyria
because 
Select and explain. 
A. they induce ALA synthase, B. they inhibit ALA synthase, C. they induce heme oxygenase, D. they inhibit heme oxygenase
A: they induce ALA synthase
Answer: A: they induce ALA synthase 
Explanation: None