All are Atropine substitutes except: (A) Procyclidine, (B) Propantheline, (C) Tiotropium, (D) Drotaverin
Answer is D. Drotaverine (INN, also known as drotaverin) is an antispasmodic drug, used to enhance cervical dilation during childbih. It is structurally related to papaverine, is a selective inhibitor of phosphodiesterase 4, and has no anticholinergic effects. Ref - medscape.com