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
Order of disease is 
Select and explain. 
A. a)	Impairment (I) — Disability(D) — Handicap (H), B. D — H — I, C. D — I — H, D. H — D — I
A: a)	Impairment (I) — Disability(D) — Handicap (H)
Answer: A: a)	Impairment (I) — Disability(D) — Handicap (H) 
Explanation: None