<prompt> Which of the following has the highest pH?Gastric juiceBile in the gallbladderPancreatic juiceSaliva  <response>: 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. 