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': 'True about actinomyces is - \nSelect and explain. \nA. Gram +ve, B. Most common site is brain, C. Tetracycline is drug of choice, D. Portal of entry is inhalation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]