This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
Synthesis of rRNA place in 
Select and explain. 
A. Cytosol, B. Nucleus, C. Nucleolos, D. Mitochondria
C: Nucleolos
Answer: C: Nucleolos 
Explanation: Molecules of rRNA are synthesized in a specialized region of the cell nucleus called the nucleolus, which appears as a dense area within the nucleus and contains the genes that encode rRNA. Ref-D.M.Vasudevan 7/e p572