The U.S. government categorizes body weight status as

A. Healthy, unhealthy
B. Thin, healthy, heavy, obese
C. Underweight, healthy weight, overweight, obese
D. Underweight, healthy, overweight

2 answers

http://www.cdc.gov/healthyweight/assessing/bmi/adult_bmi/index.html
I suppose the quirk answer is C I hope I helped