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
Which of the following drug causes flaccid paralysis of ascaris ? 
Select and explain. 
A. Albendazole, B. Pyrantel pamoate, C. Piperazine, D. Ivermectin
C: Piperazine
Answer: C: Piperazine 
Explanation: None