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
According to Dardick's multicellular theory which type of cells are not responsible for the origin of pleomorphic adenoma: 
Select and explain. 
A. Intercalated duct reserve cell., B. Myoepithelial cell., C. Excretory duct cell., D. None.
C: Excretory duct cell.
Answer: C: Excretory duct cell. 
Explanation: Dardick’s multicellular theory
Intercalated duct reserve cell → pleomorphic adenoma
Myoepithelial cell → pleomorphic adenoma