title: How to use ngSelect for JSON
body: <p>this is my json 
      [["A","aaa"],["B","bbb"],["C","ccc"]]
  here the data 'aaa', 'bbb' and 'ccc' should be displayed in the dropdown 
  when the data is selected their corresponding values ie 'A', 'B' or 'C' should be populated in the another variable </p>