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
[{'content': 'Which of the following contribute in polypeptide synthesis? \nSelect and explain. \nA. Leader sequence, B. Enhancer, C. tRNA, D. ncRNA', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Enhancer is the cis-acting DNA sequence that increases the rate of initiation of transcription of eukaryotic genes by RNA polymerase. Leader sequence is the untranslated segment of mRNA before the sta codon. Ref: Harper, 28th Edition, Page 343.', 'role': 'assistant'}]