This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Serous demilunes is present in 
Select and explain. 
A. Serous glands, B. Mucous glands, C. Mixed glands, D. All salivary glands
C: Mixed glands
Answer: C: Mixed glands 
Explanation: When the gland has this demilunar structure, it produces both serous and mucous secretions, and is thus classified as "mixed".