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: Dental
How much reduction in strength and toughness in endodontically treated molars attributed to changes in collagen cross-linking and dehydration of dentin? 
Select and explain. 
A. 5%, B. 14%, C. 21%, D. 60%
B: 14%
Answer: B: 14% 
Explanation: "Almost 14% reduction in toughness in endodontically molars compared with vital dentin due to changes in collagen cross- linking and dehydration of dentin".