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
The common causative agent in diarrhea in AIDS patients is - 
Select and explain. 
A. Toxoplasma, B. Cryptosporidium, C. Salmonellae, D. Mycobacteria
B: Cryptosporidium
Answer: B: Cryptosporidium 
Explanation: Ans. is 'b' i.e., Cryptosporidium