Radio Buttons in Lightning Component in Salesforce

Sample code:

Lightning Component:

<aura:component >
<ui:inputRadio text="Sample1" label="Sample 1" name="Role" change="{!c.onGroup}"/><br/>
    <ui:inputRadio text="Sample2" label="Sample 2" name="Role" change="{!c.onGroup}"/><br/>
    <ui:inputRadio text="Sample3" label="Sample 3" name="Role" change="{!c.onGroup}"/><br/>
    <ui:inputRadio text="Sample4" label="Sample 4" name="Role" change="{!c.onGroup}"/><br/>
    <ui:inputRadio text="Sample5" label="Sample 5" name="Role" change="{!c.onGroup}"/>

</aura:component>

Lightning Controller:

({
    onGroup: function(cmp, evt) {
        var selected = evt.getSource().get("v.text");
        alert(selected);
    }

})

Output: