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 are involved in protein folding: 
Select and explain. 
A. Rough endoplasmic reticulum, B. Smooth endoplasmic reticulum, C. Golgi apparatus, D. All
A: Rough endoplasmic reticulum
Answer: A: Rough endoplasmic reticulum 
Explanation: Rough endoplasmic reticulum has specific proprote called chaperons They help in protein folding Ref:Guyton and Hall textbook of medical physiology 12th edition ,page number:10,11,12