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
Acid fast staining can be positive with? 
Select and explain. 
A. Tubercle bacilli, B. Nocardia, C. Lipofuschin, D. All
D: All
Answer: D: All 
Explanation: Ans. d (All).(Ref. Microbiology by Ananthnarayan, 7th/357; Harsh Mohan, Pathology, 4th ed., 32)ACID FAST STAINING IS POSITIVE with {Mnemonic = MMC BLINC) :- Mycobacterium tuberculosis, - Mycobacterium leprae, - Cyclospora, - Bacterial spores, - Lipofuschin pigment,- Isospora, - Nocardia, - Cryptosporidium.Educational points:# Nocardia are aerobic, crooked, branching, beaded, gram +ve and partially acid fast filaments on microscopy. TMP- SMX is Rx of choice.# 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.