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: Physiology
[{'content': 'Which of the following secretions has a very high pH: \nSelect and explain. \nA. Gastric juice, B. Pancreatic juice, C. Bile in gall bladder, D. Saliva', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]