This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
[{'content': 'All of the following are true about V. cholerae O139 except: \nSelect and explain. \nA. Clinical manifestations are similar to O1 E1 tor, B. First discovered in Chennai, C. Produces O139 lipopolysaccharide, D. Epidemiologically indistinguishable from O1 E1 tor', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., First discovered in ChennaiO139 Vibrio was isolated first in Chennai because it was not agglutinated by any of the antisera available at that time (O1-O138) and identified as Bengal strain (O139) in Bengal in 1992 and Clinical manifestation and epidemiological features are similar to O1.O139 is identical to EI Tor except - Produces O139 Lipopolysaccharide (LPS) and Pathogenicity of O139 is due to O Ag (polysaccharide capsule).Abs to V. cholerae is not protective against O139.", 'role': 'assistant'}]