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': 'If there are 4 nucleotides instead of 3 in codon, how many amino acids may be formed? \nSelect and explain. \nA. 16, B. 21, C. 256, D. 64', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. 256', 'role': 'assistant'}]