How do the populations receiving medicare, medicaid, and schip differ?

The population receiving Medicare are the elderly and some persons with disabilities - set by the Centers for Medicare & Medicaid Services (CMS).

The populations receiving Medicaid are the indigent (poor people). The program is financed jointly by federal and state governments.

The populations receiving SCHIP (State Children's Health Insurance Program) are low-income children whose family income is above the Medicaid eligibility level in their state. This program is now known as "The Children's Health Insurance Program" (CHIP) 

call childline 0800 1111

are there any letter choices to this or is this an open ended question?