How to access json data using string variable parameter?

Question

I need to access json data

see format on this image

sample Object {BD: Object, BE: Object, BF: Object, BG: Object, BA: Object…} AD : Object AE : Object AF : Object AG : Object AI : Object AL : Object AM : Object Code ,i am using

var otherna = $('#othernation').text();
// BE a String value

when i use manual to get value it works

$.getJSON('/skins/all.json', function(data) {
                console.log(data.Results.BE);
            });

I got

Object {Name: "Belgium", Capital: Object, GeoRectangle: Object, SeqID: 20, GeoPt: Array(2)…}

when i pass this variable otherna value

  $.getJSON('/skins/all.json', function(data) {
                console.log(data.Results.otherna);
            });

I got this error undefined

please help me for this issue thanks.