Which of the Following Is Not a Mechanism Employed by the Human

Multiple Choice

Which of the following is not a mechanism employed by the human microbiota to contribute to the first line of defense?

A) It can phagocytose pathogens
B) It can lower the pH making the environment too acidic for pathogens to survive
C) It can out-compete pathogens for limited nutrients
D) It can train the immune cells to recognize antigenic markers
E) It can block potential binding sites on epithelial cells restricting adhesion,which is a necessary step for infection