Correct Answer: C

Rationale: When the body produces antibodies against its own tissue, it is called autoimmunity.

Correct Answer: B

Rationale: Androgen therapy can increase the risk of cardiovascular events, including heart attack and stroke, particularly in older patients.

Correct Answer: B

Rationale: Erectile function is primarily controlled by the parasympathetic nervous system, which facilitates the dilation of blood vessels in the penis. The parasympathetic nerves are responsible for vasodilation in the penis, allowing blood to enter and creating an erection. Sympathetic nerves, on the other hand, are responsible for ejaculation by causing contraction of the muscles around the vas deferens. Somatic nerves are involved in sensation and movement, not specifically in controlling blood supply to the penis. Spinal reflexes can play a role in the erectile process, but they are not directly responsible for controlling the venous blood supply.

Correct Answer: A

Rationale: High blood pressure is a significant contraindication for the use of combined oral contraceptives due to the increased risk of stroke and myocardial infarction.

Correct Answer: B

Rationale: Lead poisoning primarily affects red blood cells, causing anemia. Hence, the priority test would be to assess red blood cell levels and morphology.