This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: VBDs, Arboviral & Viral Infections, Surface Infections, Subject name: Social & Preventive Medicine
Point mutation is seen in 
Select and explain. 
A. Antigenic shift, B. Antigenic drift, C. Both of above, D. None of above
B: Antigenic drift
Answer: B: Antigenic drift 
Explanation: Antigenic shift may be due to genetic recombination, reassoment, rearrangement Sudden change in Antigenic variation occurs. Antigenic drift due to point mutation Antigenic change is Gradual over a Period of Time.