All of the Following Statements About HMO Care Are True

All of the following statements about HMO care are true EXCEPT:

A) They decrease health care costs by classifying all health problems into "diagnostic-related groups" and then giving practitioners and hospitals a set fee for treatment of a given problem
B) They require that all patient's care be approved by the doctor as well as the HMO organization
C) HMO patients are more likely to be admitted than non HMO's
D) Patients must choose doctors who participate within the HMO