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
Of the total amount of  saliva secreted by all the salivary glands in a day, more than half is secreted by: 
Select and explain. 
A. Parotid gland., B. Submandibular gland., C. Sublingual gland., D. Combined secretion from minor salivary glands.
B: Submandibular gland.
Answer: B: Submandibular gland. 
Explanation: Submandibular gland secrets about 60% of the saliva, parotid glands about 35% and remaining 5% is contributed by minor salivary glands.