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': 'How does gall bladder effect on pH of bile? \nSelect and explain. \nA. Makes bile pH neutral, B. Bile pH decreases from 8 - 8.6 to 7 - 7.6., C. Bile pH increases from 7 - 7.6 to 8 - 8.6., D. No effect on bile pH', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Bile pH decreases from 8 - 8.6 to 7 - 7.6. Alteration of Bile pH: Becomes less alkaline during storage. Bile pH decreases from 8 - 8.6 to 7 - 7.6.', 'role': 'assistant'}]