This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Proteins and Amino Acids, Subject name: Biochemistry
[{'content': 'Which of the following nitrogen base is not seen in RNA: \nSelect and explain. \nA. Adenine, B. Thymine, C. Guanine, D. Cytosine', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. (b) ThymineRef: Harper's Biochemistry, 30th pg. 341, 29th ed. pg. 344Nitrogen Bases present in RNA are-Nitrogen Bases present in DNA are-* Adenine* Adenine* Guanine* Guanine* Uracil* Thymine* Cytosine* Cytosine", 'role': 'assistant'}]