This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
Which of the following is not helpful in preventing dracunculiasis? 
Select and explain. 
A. Filtering of drinking water, B. Active search for new cases, C. Mass mebendazole treatment, D. Education regarding water hygiene
C: Mass mebendazole treatment
Answer: C: Mass mebendazole treatment 
Explanation: No drug is suitable for effective mass treatment. However infected persons are treated with niridazole, mebendazole or metronidazole.