This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
The following has rough appearance: 
Select and explain. 
A. Rough endoplasmic reticulum, B. Agranular endoplasmic reticulum, C. Golgi apparatus, D. All
A: Rough endoplasmic reticulum
Answer: A: Rough endoplasmic reticulum 
Explanation: Rough endoplasmic reticulum has granules on the surface hence appear rough The granules mainly contain ribosomes and involved in protein synthesis