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: Unknown
[{'content': 'Adenocarcinoma of ethmoid sinus associated with \nSelect and explain. \nA. Woodworkers, B. Nickel workers, C. Coal workers, D. Chimney workers', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e Woodworkers Workers of wood industry develop - Adenocarcinomas of ethmoid & other nasal sinusesWorkers of Nickle refining industry - Sq. cell Ca & anaplastic Ca of nasal sinuses.", 'role': 'assistant'}]