This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Anticholinesterases are effective against all, except : 
Select and explain. 
A. Cobra bite., B. Postoperative ileus., C. Carbamate poisoning., D. Belladona poisoning.
C: Carbamate poisoning.
Answer: C: Carbamate poisoning. 
Explanation: None