This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetics, Subject name: Pathology
Gene silencing means a gene which would be expressed under normal circumstances is switched off by cell machinery. Which one of the following cellular components is not involved in gene silencing? 
Select and explain. 
A. Micro-RNA, B. Double stranded RNA, C. Ribosomal RNA, D. Si RNA
C: Ribosomal RNA
Answer: C: Ribosomal RNA 
Explanation: Ans. (c) Ribosomal RNA(Ref: Robbins 9th/pg 172-173)Two of the leading methods of gene silencing are RNA interference (RNAi), Si RNA and antisense oligonucleotides (ASOs), ds RNAIt does not affect ribosomal RNA