Cyst phase does not exist in -: (A) Gardenella vaginalis, (B) Trichomonas vaginalis, (C) Entamoeba hystolytica, (D) Entamoeba coli
Answer is A. Gardnerella is a genus of Gram-variable-staining facultative anaerobic bacteria of which G. vaginalis is the only species. The organisms are small nonspore-forming, nonmotile coccobacilli.