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
Pa of M-RNA removed during protein synthesis ? 
Select and explain. 
A. Interon, B. Codon, C. Exon, D. Suistron
A: Interon
Answer: A: Interon 
Explanation: A i.e. Interon