Question

which of the following is not a pathogen? a foreign material b bacteria c viruses d leukocytes

Explanation:

Pathogens are agents that can cause disease. Bacteria and viruses are well - known pathogens. Foreign material can sometimes act as an antigen and cause immune responses related to disease. Leukocytes are white blood cells which are part of the body's immune system that fight against pathogens, not pathogens themselves.

Answer:

D. leukocytes