This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cholinergic System, Subject name: Pharmacology
Which is not an alkaloid? 
Select and explain. 
A. Morphine, B. Neostigmine, C. Emetine, D. Atropine
B: Neostigmine
Answer: B: Neostigmine 
Explanation: ANSWER: (B) NeostigmineREF: KDT 6th edition various chaptersSome alkaloids used as drugs are:Local anesthetic and stimulant cocaineThe psychedelic psilocinThe stimulant caffeine; nicotineThe analgesic morphineThe antibacterial berberineThe anticancer compound vincristineThe antihypertension agent reserpineThe cholinomimetic galatamineThe spasmolysis agent atropineThe vasodilator vincamineThe anti-arhythmia compound quinidineThe anti-asthma therapeutic ephedrineThe antimalarial drug quinineThe emetic emetine