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
Maldigestion of protein and fat is manifested in chronic pancreatitis only if the damage of pancreatic tissue exceeds? 
Select and explain. 
A. 30%, B. 50%, C. 90%, D. 75%
C: 90%
Answer: C: 90% 
Explanation: 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