This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cellular Pathology, Subject name: Pathology
[{'content': 'Which of the following function is done by RNAi in a gene? \nSelect and explain. \nA. Knock in, B. Knockout, C. Knockdown, D. Knock up', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Knock down(Ref: Robbins 9th/pg 3-4)Small interfering RNAs (siRNAs)*Short RNA sequences introduced experimentally into cells*Their action is similar to endogenous miRNAs.*Synthetic siRNAs targeted against specific mRNA have become useful laboratory tools to study gene function (so-called "knockdown technology")', 'role': 'assistant'}]