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
[{'content': '"Citron bodies" boat or leaf shaped pleomorphic organism in an exudate is \nSelect and explain. \nA. Cl. welchii, B. Cl. edematiens, C. Cl. septicum, D. Cl. tetani', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is \'c\' i.e., Clostridium septicum Citron bodies and boat or leaf shaped pleomorphic bacilli with irregular staining suggest CL septicum". Clostridium Clostridial species are : Gram positive Anaerobic (obligate anaerobe) Spore forming Bacilli Motile by peritrichate flagella except C perfringens and C. tetani type IV which are non motile. Non capsulated except C. perfringens and C. butyricum which are capsulated Pathogenesis is due to exotoxin not endotoxin. Clostridium botulinum causes botulism not gas gangrene. Gas gangrene is caused by : C. perfringens (80%) - C novyi C. septicum - C. histolyticum', 'role': 'assistant'}]