This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
Which of the following stains positive with modified AFB stain? 
Select and explain. 
A. Bacilus anthrax, B. Corynebacterium diphtheriae, C. Cryptosporidium parvum, D. Actinomycetes
C: Cryptosporidium parvum
Answer: C: Cryptosporidium parvum 
Explanation: Ans. c (Cryptosporidium parvum) (Ref. Ananthanarayan microbiology 6th ed. 371; Harsh Mohan Pathology 4th ed., 32)ACID FAST STAINING IS POSITIVE WITH-# Mycobacterium tuberculosis# Mycobacterium leprae# Nocardia# Cyclospora# Cryptosporidium parvum (Modified AFB stain)# Isospora (Modified AFB stain)# Bacterial spores# Lipofuschin pigment# Rodococcus equi- Lipofuschin is wear and tear lipid pigment in cells and can be stained by fat stains but differs from other lipids in being fluorescent and acid fast.- Acid fastness of tubercle bacillus is a scribed to the presence in the bacillus of an unsaponifiable wax (Mycolic add) or to a semi-permeable membrane around the cell. It is related to integrity of the cell and appears to be a property of lipid-rich waxy cell wall.