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
[{'content': 'Number of t-RNA present in cells is \nSelect and explain. \nA. 23, B. 25, C. 28, D. 30', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The number of tRNAs in most cells is more than the number of amino acids used in protein synthesis (20) and also differs from the number of amino acid codons in the genetic code (61)Ref: DM Vasudevan, 7th edition, page no: 596, 597', 'role': 'assistant'}]