This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal System, Subject name: Physiology
Which of the following has the highest pH? 
Select and explain. 
A. Gastric juice, B. Bile in the gallbladder, C. Pancreatic juice, D. Saliva
C: Pancreatic juice
Answer: C: Pancreatic juice 
Explanation: Gastric juice has lowest pH among the given options. Primary salivary secretion has a pH little below 7 {6.35-6.85}; after ductular modification, that is HCO3- is added, pH increases up to 8. Pancreatic juice has a pH of about 8-8.3. Gallbladder bile has a pH of about 6.