This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
One virus paicle prevents multiplication of second virus. This phenomena is? 
Select and explain. 
A. Viral interference, B. Mutation, C. Supervission, D. Permutation
A: Viral interference
Answer: A: Viral interference 
Explanation: Growth of first will inhibit infection by seconds Vitus by interference REF:MICROBIOLOGY ANANTHA NARAYANAN NINTH EDITION PAGE.436