Question

what does your immune system do?
a. makes you sick

b. keep your brain sharp

c. protect you from illness

d. make energy for your body

Explanation:

The immune system's main function is to defend the body against pathogens and foreign substances, thus protecting from illness. Option a is incorrect as it's the opposite. Option b is related to the nervous system or cognitive health, not the immune system. Option d is the role of cellular processes like in mitochondria, not the immune system. So the correct option is c.

Answer:

c. protect you from illness