Final answer:
The President who had Addison's disease was Franklin D. Roosevelt.
Step-by-step explanation:
The correct answer is b. Franklin D. Roosevelt.
Addison's disease is a disorder characterized by hyposecretion of the hormone cortisol. One of the distinctive signs of Addison's disease is hyperpigmentation of the skin, which is caused by the overproduction of melanocyte-stimulating hormone (MSH).
While both POMC (pro-opiomelanocortin) and MSH contribute to hyperpigmentation in Addison's disease, it is important to note that hyperpigmentation is not always present in all cases of Addison's disease.