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
Enzymes required for mRNA synthesis is/are ? 
Select and explain. 
A. RNA polymerase I, B. RNA polymerase II, C. Primase, D. Topoisomerase
B: RNA polymerase II
Answer: B: RNA polymerase II 
Explanation: Ans. is 'b' i.e., RNA polymerase II It catalyzes the synthesis of mRNA, small nuclear RNA (sn-RNA) and miRNA.These products are coded by class II gene, i.e. class II gene is transcribed by mRNA.Class II gene differ from class I and III in that one of its transcribed products (mRNA) is translated into protein.