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': 'Endotoxin of which gram negative bacteria does not cause pathogenesis of natural disease? \nSelect and explain. \nA. E. coli, B. M. tuberculosis, C. V. Cholera, D. Pseudomonas aerogenosa', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Culture\nV cholerae produces convex, smooth, round colonies that are opaque and granular in transmitted light. V cholera and most other vibrios grow well at 37°C on many kinds of media, including defined media containing mineral salts and asparagines mineral salts and asparagines as sources of carbon and nitrogen. V cholerae grows well on thiosulfate-citrate-bile-sucrose (TCBS) agar, on which it produces yellow colonies that are readily visible against the dark-green background of the agar.', 'role': 'assistant'}]