The following are multiple choice questions (with answers) about medical knowledge.   **Question:** All are true about nitric oxide, EXCEPT:   (A) Regulates vasomotor tone   (B) Acts via cAMP   (C) Present in cigarette smoke   (D) It is important in penile erection
['(B) Acts via cAMP <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Regulates vasomotor tone \n (B) Acts via cAMP \n (C) Present in cigarette smoke \n (D) It is important in penile erection <> possible answers', '  All are true about nitric oxide, EXCEPT: <> context@']