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: Medicine
[{'content': 'Maldigestion of protein and fat is manifested in chronic pancreatitis only if the damage of pancreatic tissue exceeds? \nSelect and explain. \nA. 30%, B. 50%, C. 90%, D. 75%', 'role': 'user'}, {'content': 'Answer: C \nExplanation: There is a very large reservoir of pancreatic exocrine function. > 90% of the pancreas must be damaged before maldigestion of fat and protein is manifested. Reference: Harrisons Principles of Internal Medicine, 18th Edition, Page 2629', 'role': 'assistant'}]