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: Microbiology
Antigenic variation is not seen in: 
Select and explain. 
A. Influenza type A, B. Influenza type B, C. Influenza type C, D. None of the above
C: Influenza type C
Answer: C: Influenza type C 
Explanation: Influenza type C