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
All of the following are sexually transmited, Except? 
Select and explain. 
A. Candida albicans, B. Echinococcus granulosus, C. Molluscum contagiosum, D. Group B streptococcus
B: Echinococcus granulosus
Answer: B: Echinococcus granulosus 
Explanation: Ans. is 'b' i.e., Echinococcus granulosus Impoant sexually transmitted agents 1. Bacteria . Chlamydia trachomatis . Calymmatobacterium granulomatis * Group B streptococci . Neisseria gonorrhoae . Ureoplasma urealyticum . Treponema pallidum . Mycoplasma homnis . Haemophilus ducreyi . Bacterial vaginosis - associated organisms 2. Viruses . HIV .HPV . CMV . HTLV 1 . HSV - 2 . HBV . Molluscum contagiosum 3. Protozoal agents . Entamoeba histolytica . Giardia . Trichomonas vaginalis 4. Fungal agents --> Candida albicans 5. Ectoparasites --> Phthirus pubis, Sarcoptes scabies Note - . Chlamydia is the most common cause of STD. . Amongst viruses, HPV is the most common cause.