What is the role of antigens in the body's defence against disease? (A) They bind to invading pathogens - HSC - SSCE Biology - Question 9 - 2008 - Paper 1

Antigens play a crucial role in the immune system by being the substances that the immune system recognizes as foreign. They trigger the immune response, which helps the body to identify and attack pathogens such as viruses and bacteria. This means that the correct answer is (B) They trigger the immune response.