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
[{'content': 'Protein synthesis occurs in: September 2012 \nSelect and explain. \nA. Smooth endoplasmic reticulum, B. Rough endoplasmic reticulum, C. Golgi bodies, D. Nucleus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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).', 'role': 'assistant'}]