Which of the following is part of the innate immune response? A - HSC - SSCE Biology - Question 5 - 2019 - Paper 1

The innate immune response is the body's first line of defense against pathogens and does not require prior exposure to the pathogen. Among the options provided:

• Antibodies are part of the adaptive immune response, which develops after exposure to a pathogen.
• Phagocytes are a key component of the innate immune response, as they engulf and digest pathogens.
• Stomach acid acts as a barrier to pathogens, but it is not categorized as part of the immune response per se.
• B lymphocytes are also part of the adaptive immune response, responsible for producing antibodies.

Thus, the correct answer is B. Phagocytes, as they play a direct role in the innate immune defense.