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: Pharmacology
[{'content': 'All true except ? \nSelect and explain. \nA. Cotrimoxazole is effective against P carinii, B. Clarithromycin effective against mycobacterium avium complex, C. Doxycycline is effective against legionella, D. Ceftriaxone is effective against gonorrhea', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Doxycycline is effective against legionella", 'role': 'assistant'}]