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
Best preservative for protozoal cysts is 
Select and explain. 
A. 10 % formalin, B. Isopropyl alchol, C. HCL Solution, D. Naoh solution
A: 10 % formalin
Answer: A: 10 % formalin 
Explanation: 10 % formalin is ALL - purpose fixative used for preservation of morphology of helminth eggs, larvae, protozoan cysts and coccidian.