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
Cryptosporidium cyst identified by which stain in stool sample? 
Select and explain. 
A. PAS, B. H and E, C. Giemsa, D. Acid fast stain
D: Acid fast stain
Answer: D: Acid fast stain 
Explanation: Ans. d. Acid fast stain