This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, 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: (Cryptosporidium) (589-A 7th)* Cryptosporidium has assumed great importance as a frequent cause of intractable diarrhoea in AIDS patients. It can lead to acute self limited diarrhoea in previously healthy persons and chronic life threatening diarrhoea in immunocompromised.