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: Microbiology
A 35yr old heterosexual patient diagnosed with Hiv had hlo etc watery diarrhea Colonoscopic biopsy shown as below Which of the following is your most probable diagnosis 
Select and explain. 
A. Giardia, B. Cryptosporidium, C. Microspora, D. CMV
B: Cryptosporidium
Answer: B: Cryptosporidium 
Explanation: ref : baveja microbiology