The Stomach Can Be Considered the First Line of Defense

The stomach can be considered the first line of defense against microbial infections because:

A) Most microorganisms are susceptible to the antibiotics and alkaline pH present in the stomach.
B) Most microorganisms are killed by the liver enzymes that are emptied into the stomach during a meal.
C) The stomach produces lipase, which attacks the lipopolysaccharide cell wall of the organisms.
D) Most microorganisms are susceptible to the acid pH of the stomach.