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': 'Shigellosis is best diagnosed by ? \nSelect and explain. \nA. Stool examination, B. Stool culture, C. Sigmoidoscopy, D. Enzyme', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is `b\' i.e., Stool culture Lab diagnosis "Diagnosis is made by isolating the bacillus from feces." . Transpo media - Sach\'s buffered glycerol saline . Culture - Specimens are inoculated on : 1) MacConkey medium 2)Deoxycholate medium (DCA) --> Selective medium 3)Hektoen entric agar or salmonella-shigella agar --> Selective medium', 'role': 'assistant'}]