input: def get_countries():
      """ 
      Return a list of all countries in the world by loading it from a JSON file 'data.json'. 
      
      >>> get_countries()
      {"countries": ["Afghanistan", "Albania", ...]}
      """
output:     
      import json
  
      with open('data.json', 'r') as file:
          data = json.load(file)
      return data
  