Drugs Like Viagra and Cialis Work by

Drugs like Viagra and Cialis work by

A) causing sexual arousal, which causes the release of nitric oxide, which causes erection.
B) strengthening the nerve pathway involved in erection, leading to increased nitric oxide, leading to erection.
C) increasing the responsiveness of the erectile tissue to nitric oxide, leading to erection in the presence of sexual arousal.
D) altering the relative pressure in the corpora cavernosa, leading to nitric oxide release, leading to erection.
E) releasing nitric oxide, causing repair of nerves and leading to erection.