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
Drug detoxification and steroid synthesis occur in 
Select and explain. 
A. Mitochondria, B. Smooth endoplasmic reticulum, C. Rough endoplasmic reticulum, D. Cytoplasm
B: Smooth endoplasmic reticulum
Answer: B: Smooth endoplasmic reticulum 
Explanation: None