This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and PNS, Subject name: ENT
Wood worker's associated sinus Ca is: (PGI Dec 2006) 
Select and explain. 
A. Adeno Ca, B. Sq cell Ca, C. Anaplastic Ca, D. Melanoma
A: Adeno Ca
Answer: A: Adeno Ca 
Explanation: Ans: A (Adeno Ca) "Workers of furniture industry develop Adenocarcinoma of the Ethmoids and upper nasal cavityQ-while those engaged in Nickel refining get squamos cell and anaplastic carcinomaQ- Dhingra 5th/219