Radio Button is a series of on-screen buttons that allow only one selection to be made from the group. A selected button will automatically de-select when any other button is selected.
Radio buttons come from the early days of radio which had five or six preset station buttons in a row. Pressing one button deselected the other station.
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Tokyo & Osaka are widely regarded as the cities with the highest cost of living by several surveys. Asuncion in Paraguay is considered the cheapest.
The parameters determining the cost of living include housing, transport, food, clothing and entertainment.