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: Surgery
[{'content': 'Actinomycosis most commonly affects \nSelect and explain. \nA. Thorax, B. Facio - cervical region, C. Liver, D. Pelvis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Facio - cervical Actinomycosis is most common type.', 'role': 'assistant'}]