A patient has recently been diagnosed with multiple sclerosis. Which response best explains the etiology of multiple sclerosis (MS)?

A. Steroid injections will be administered daily: This is incorrect; steroid therapy may exacerbate Cushing's disease. The condition is often due to excessive production of cortisol, not a deficiency.

B. Weight gain and edema are present: Hyperaldosteronism, often associated with Cushing's syndrome, leads to sodium and water retention, resulting in weight gain and edema.

C. Painful leg cramps are common from hyperkalemia: Hyperaldosteronism typically causes hypokalemia, not hyperkalemia, leading to muscle cramps, not leg pain from hyperkalemia.

D. Decreased amount of body hair is frequently seen: Cushing's disease often leads to hirsutism (increased body hair), not a decrease.

A. His body does not produce any insulin so he must receive insulin injections: Type I diabetes is characterized by the destruction of pancreatic beta cells, resulting in little to no insulin production. Therefore, insulin must be administered via injection to replace the insulin the body cannot produce.

B. The pills are not as effective as the insulin injections: While this might be partially true for Type I diabetes, it is not the complete answer. Oral medications are generally not effective in Type I diabetes because they stimulate the pancreas to produce insulin, which is not possible in these patients.

C. He will only be on insulin injections for a short while, then he can take a pill: This is incorrect. Type I diabetes requires lifelong insulin therapy.

D. He can stop the insulin injections once his body begins to make insulin again: This is incorrect as Type I diabetes is a permanent condition where the body cannot produce insulin.