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': 'Pa of M-RNA removed during protein synthesis ? \nSelect and explain. \nA. Interon, B. Codon, C. Exon, D. Suistron', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Interon', 'role': 'assistant'}]