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: Biochemistry
Protein biosynthesis occurs in ? 
Select and explain. 
A. Cytoplasm, B. ER, C. Ribosomes, D. Mitochondria
C: Ribosomes
Answer: C: Ribosomes 
Explanation: Although both ribosomes & RER are involved in synthesis of protein, the cellular component on which all intractions take place to synthesize the protein is ribosome.