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: ENT
[{'content': 'Wood workers are associated sinus Ca \nSelect and explain. \nA. Adeno Ca, B. Sq. cell Ca, C. Anaplastic Ca, D. Melanoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]