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
[{'content': 'Which of the following drug causes flaccid paralysis of ascaris ? \nSelect and explain. \nA. Albendazole, B. Pyrantel pamoate, C. Piperazine, D. Ivermectin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]