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: Anatomy
Submandibular gland is: 
Select and explain. 
A. Pure serous., B. Pure mucous., C. Mixed and predominantly serous., D. Mixed and predominantly mucous.
C: Mixed and predominantly serous.
Answer: C: Mixed and predominantly serous. 
Explanation: None