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': 'Probiotic organism used is: \nSelect and explain. \nA. E. coli, B. Bifido bacteria, C. Staphylococcus, D. Salmonella', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Probiotics are live microorganisms promoted with claims that they provide health benefits when consumed, generally by improving or restoring the gut flora.\xa0\nProbiotics are considered generally safe to consume, but may cause bacteria-host interactions and unwanted side effects in rare cases.\xa0\nProbiotics such as B. bifidum have exploded in popularity recently.\xa0\nBifidobacteria are Gram positive, non-sporing,pleomorphic, non-motile bacilli showing true and false branching.\xa0\nThe name is derived from frequent bifid Y-shaped cells.\xa0\nThey occur as normal flora in the mouth and gastrointestinal tract and are occasionally pathogenic.\xa0\nDental caries is the most common clinical entity in which B. dentium may have a pathogenic role.\n\nRef :textbook of microbiology, C P Baveja,5th edition pg no:239', 'role': 'assistant'}]