This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Streptococci, Subject name: Microbiology
45 yrs old Ramlal has intraabdominal sepsis. The causative organism was found to be vancomycin, gentamycin and ampicillin resistant. It grows well in presence of 6.5% NaCl and arginine. Bile ascenlin hydrolysis is positive. Which of the following is this organism? 
Select and explain. 
A. Streptococcus agalactae, B. Enterococcus fecalis, C. Streptococcus bovis, D. Streptococcus pneumoneae
B: Enterococcus fecalis
Answer: B: Enterococcus fecalis 
Explanation: Ans. is 'b' i.e. Enterococcus fecalis Enterococcus belongs to Group D of Lancefield classification of Streptococci.Group D includesEnterococcal groupNon enterococcal group eg. Strep bovis.CHARACTERISTICS OF MEDICALLY IMPORTANT STREPTOCOCCI*OrganismGroupHemolysisHabitatLaboratory propertyDiseasesStreptococcus pyogenesABetaThroat, skin* Inhibited by bacitracin*PYR test positivePharyngitis,impetigo,Rheumatic fever,glomerulonephritisStreptococcus agalactiaeBBetaFemale genital tract* CAMP test** M.C. cause of neonatal meningitis & sepsisViridans streptococcus Alpha noneMouth, throat, colon, female genital tractColony not soluble in bileDental caries (S.mutans)endocarditis abscessStreptococcus pneumoniaeNoneAlphaThroatSusceptible to Optochin*, colony bile soluble*,Quellung +ve*Pneumoniameningitis,endocarditisPeptostrep- tococcusNoneNone, alphaMouth, colon, female genital tractObligate anaerobesAbscesses