Which of the following is not one of the four health conditions that account for the majority of healthcare costs? cancer hiv obesity diabetes

HIV would not account for the majority of healthcare costs. 
Cancer is a massive going disease without a cure and it is one of the leading killers of this nation so it is certainly on the majority of healthcare costs.
Every day another person in the United States will have another surgery or another medication due to obesity so it also is on the healthcare cost majority list.
People every day will become a diabetic and will need medicine so it is also on the majority healthcare cost list.