This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Clostridium, Subject name: Microbiology
[{'content': 'Drug induced pseudomembraneous colitis is caused by \nSelect and explain. \nA. Cl.perfringens, B. Cl.difficile, C. Cl.tetani, D. Fusobacterium', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans: b) Cl.difficile* CLdifficile is a gram positive bacillus* Non haemolytic, saccharolytic, weakly proteolytic* Pseudomembraneous colitis is due to enterotoxin (toxin A) & cytotoxin (toxin B) and Binary toxin* The toxin is neutralised by Clostridium sordelli antitoxin* Drug of choice: Metronidazole* Most common clinical feature: diarrhoea* Entire colon is affected in 90% patients, 70% have rectal sparing* Most sensitive test: stool culture for Cl.difficile* Probiotic medicine in treatment of it: saccharomyces boulardi* Drugs, causing this : clindamycin, ampicillin, cephalosporins (ceftriaxone, cefotaxim, cefuroxime, ceftazidime) & fluoroquinolone (ciprofloxacin, levofloxacin, gatifloxacin, moxifloxacin)', 'role': 'assistant'}]