According to the national institute for mental health estimates that to % of all doctor visits are for stress-related illnesses.

70 to 80%

Explanation:

The national institute for mental health(NIMH), understand the stress issues and prevent them on the basis of researches.  

When the stress become constant and chronic, then it will cause a serious health issue. Stress related illness increases the risk of mental and physical health. Stress will causes a serious problems as follows:

 Mental disorder  High blood pressure  Depression  Anxiety

Thus, 70 to 80% doctors deals with cases of chronic stress.

There are eight major endocrine glands, each with a different function: pituitary gland: the “brain” of the endocrine system; regulates all seven of the other glands and secretes growth hormone.thyroid: regulates a person’s metabolic rate, which is the amount of energy expended daily by a person at rest.thymus: assists in the development of a person’s immune system.adrenal gland: regulates fluid and sodium balance within the body, and secretes epinephrine (“adrenaline”) when the body is under stress, producing the fight-or-flight response.ovaries (in females) and testes (in males): control the development of secondary sex characteristics.pancreatic islets: regulate blood sugar.pineal gland: regulates biorhythms and mood, and stimulates the onset of puberty.

Your answer should be c