This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
Anti-cholinesterases are ineffective against: 
Select and explain. 
A. Belladona poisoning, B. Carbamate Poisoning, C. Postoperative ileus, D. Cobra bite
B: Carbamate Poisoning
Answer: B: Carbamate Poisoning 
Explanation: Ref:KD Tripathi pharmacology 7th edition (page.no: 110,105) Carbamate is irreversible anticholinesterase. so, anticholinesterases are ineffective against carbamate poisoning. Uses of anticholinesterases - Miotic, Myasthenia gravis, Postoperative paralytic ileus, Cobra bite, Belladonna poisoning, Alzheimer's disease