This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and paranasal sinuses, Subject name: ENT
[{'content': 'Sinonasal neoplasm is commonly seen in which industry? \nSelect and explain. \nA. Fishing, B. Building, C. Hard wood, D. Iron steel', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Aetiology of malignant neoplasms Cause of sinus malignancy is largely unknown. People working in the hardwood furniture industry, nickel refining, leather work and manufacture of mustard gas have shown a higher incidence of sinonasal cancer. (Ref: Textbook of diseases of ENT, PL Dhingra, 7th edition, pg no. 231)', 'role': 'assistant'}]