This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Structure and function of protein, Subject name: Biochemistry
Synthesis of secretory proteins takes place in 
Select and explain. 
A. Golgi complex, B. Endoplasmic reticulum, C. First in cytoplasm then in nucleus, D. First in endoplasmic reticulum then in cytoplasm
B: Endoplasmic reticulum
Answer: B: Endoplasmic reticulum 
Explanation: Secretory proteins are synthesized in EPR Reference: Harper; 30th edition