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': 'A codon consists of \nSelect and explain. \nA. Two complementary base pairs, B. Three consecutive nucleotide units, C. An individual ribosome, D. Four individual nucleotides', 'role': 'user'}, {'content': "Answer: B \nExplanation: A codon is a sequence of 3 nucleotides from 5' → 3' end corresponds to one amino acid.", 'role': 'assistant'}]