Read the following Assertion and Reason and choose the correct option. Assertion: Acquired immunity is characterized by memory, which leads to a stronger response upon subsequent encounters with the same pathogen. Reason: The primary immune response is of high intensity, while the secondary immune response is weaker.

Step-by-step solution

Acquired immunity, on the other hand is pathogen specific. It is characterised by memory. This means when our body encounters a pathogen for the first time it produces a response called primary response which is of low intensity. Subsequent encounter with the same pathogen elicits a highly intensified secondary or anamnestic response. This is ascribed to the fact that our body appears to have memory of the first encounter. The primary and secondary immune responses are carried out with the help of two special types