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: Pathology
Squamous cell carcinoma arise from: 
Select and explain. 
A. Intercalated duct reserve cell., B. Excretory duct reserve cell., C. Both of the above., D. None.
B: Excretory duct reserve cell.
Answer: B: Excretory duct reserve cell. 
Explanation: None