D because if you have already tried one treatment and it caused a infection you would need to change it
1. Tricare Prime is cheaper than Tricare Extra;2. Tricare Prime beneficiaries can only use Military Treatment Facility,
whileTricare Extra beneficiaries can use any civilian healthcare provider
payable under Tricare rules;
3. Beneficiaries (retirees) of Tricare Prime have to pay a small co payment
for while Tricare Extra (retirees) do not.
4. There is an annual enrollment fees for military retirees in Tricare Prime,
but there is no annual enrollment fees for Tricare Extra;
5. Tricare Prime is a Health Maintenance Organization (HMO) while Tricare
Extra represents a Preferred Provider Organization (PPO);
The answer is c because it toxins
