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: Microbiology
Doc for Cryptosporidium parvum is 
Select and explain. 
A. Nitazoxanide, B. Cotrimoxazole, C. Ivermectin, D. DEC
A: Nitazoxanide
Answer: A: Nitazoxanide 
Explanation: Nitazoxanide is Doc for Cryptosporidium.
Cotrimoxazole is Doc for Cyclospora and isospora.