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
Any restriction or inability to perform an activity in a range considered normal for a human being? 
Select and explain. 
A. Disease, B. Impairment, C. Disability, D. Handicap
C: Disability
Answer: C: Disability 
Explanation: None