This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
Agranular endoplasmic reticulum is involved in the synthesis of 
Select and explain. 
A. Protien, B. Lipid, C. Carbohydrate, D. Vitamin D
B: Lipid
Answer: B: Lipid 
Explanation: Agranular Endoplasmic reticulum is also called smooth Endoplasmic reticulum. It is the site of steroid synthesis and detoxification. Granular is involved in protein synthesis.(REF: Ganong&;s Review of medical physiology)