Correct Answer: A

Rationale: Taking oral contraceptives at the same time each day helps maintain stable hormone levels and ensures their effectiveness in preventing pregnancy.

Correct Answer: A

Rationale: Tamsulosin relaxes the muscles in the prostate and bladder neck, leading to improved urinary flow and reduced symptoms of BPH.

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

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.