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
Total volume of saliva secreted daily is approximately: 
Select and explain. 
A. 3-3.5 Litr., B. 2-2.5 Litr., C. 0.75-1Litr., D. 1-1.5 Litr.
C: 0.75-1Litr.
Answer: C: 0.75-1Litr. 
Explanation: None