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: Dental
Demilunes of Giannuzzi are: 
Select and explain. 
A. Mucous cells, B. Serous cells., C. Mixed cells., D. None of the above.
B: Serous cells.
Answer: B: Serous cells. 
Explanation: None