This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, Subject name: Pharmacology
[{'content': 'Nalidixic acid is used in:(1994) \nSelect and explain. \nA. UTI, B. Bacillary dysentry, C. Enteric fever, D. Malaria', 'role': 'user'}, {'content': 'Answer: A \nExplanation: a', 'role': 'assistant'}]