Regarding vaccination which provides protection against infectious diseases, which of the following statements is/are correct? 1. It prevents entry of infectious agent in the body. 2. It produces antibodies against infection. 3. It kills the infectious agent when it enters the body. Select the correct answer using the code given below.

Vaccination works by stimulating the immune system to produce antibodies and memory cells against a specific pathogen (statement 2 correct). It does NOT physically prevent the entry of the infectious agent into the body (statement 1 incorrect), nor does the vaccine itself directly kill the pathogen when it enters – it primes the immune response, which then neutralises the pathogen (statement 3 as worded is incorrect; killing is done by the immune system, not by the vaccine). Hence only statement 2 is correct.