Regarding the assertion and reason, select the right option.
Assertion [A]: An individual suffering from chicken pox is usually not infected by the same virus for the second time in his/her life.
Reason [R]: Memory immune cells trigger immediate and complete secondary response during a second encounter.
Both A and R are true and R explains A
Adaptive or acquired immunity in humans is acquired through contact with specific pathogens during our lifetime. In case of pathogen-specific diseases like chickenpox, the memory cells in the immune system records necessary information about the chickenpox virus in the initial or first attack. In the second invasion of the same pathogen, the immune system would be able to provide a specific, faster and intensified response. Such a response is called secondary response.