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
Sabin-Feldman dye test is used for diagnosis of: March 2005, 2009 and September 2007 
Select and explain. 
A. Cryptosporidium, B. Babesia, C. Pneumocystis, D. Toxoplasma
D: Toxoplasma
Answer: D: Toxoplasma 
Explanation: Ans. D: Toxoplasma The most common method of laboratory diagnosis of toxoplasma gondii is by serology like Sabin-Feldman dye test, indirect immunofluorescence, indirect haemagglutination, complement fixation and ELISA. Sabin-Feldman dye test is based on the specific inhibition by antibody of the staining of the trophozoite by alkaline methylene blue.