90. Which of the following statements about drugs and inhibitors is TRUE?
(A) Caffeine overdose can prevent sleep because it acts on adenine receptor.
(B) Viagra is used to treat erectile dysfunction because it acts by increasing NO level.
(C) Botulinum toxin is used to diminish facial glabellar lines because it acts by blocking voltage-gatedNa+channel.
(D) Lovastatin is used for lowering cholesterol because it acts by decreasing low-density lipoproteinlevel.
(E) Aspirin is used to treat pain and fever because it acts reversibly by suppressing thecyclooxy genase.