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
Sinonasal neoplasm is commonly seen in which industry? 
Select and explain. 
A. Fishing, B. Building, C. Hard wood, D. Iron steel
C: Hard wood
Answer: C: Hard wood 
Explanation: 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)