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: Physiology
Protein synthesis occurs in: September 2012 
Select and explain. 
A. Smooth endoplasmic reticulum, B. Rough endoplasmic reticulum, C. Golgi bodies, D. Nucleus
B: Rough endoplasmic reticulum
Answer: B: Rough endoplasmic reticulum 
Explanation: Ans. B i.e. Rough endoplasmic reticulumRough ERThe surface of the rough endoplasmic reticulum (often abbreted RER) is studded with protein-manufacturing ribosomes giving it a "rough" appearance (hence its name).