sub question for single selection

{
 "userid": "59f6c8ebf36d282363081d87",
 "title": "NDWJN",
 "questionTemplate": [
   {
     "question": "Multi selection",
     "answers": [
       {
         "answer": "AAA"
       },
       {
         "answer": "BBB"
       }
     ],
     "questionTemplateId": "5f89233c62b35b1a6ca492ef",
     "type": 2
   },
   {
     "question": "Single selection",
     "answer": "A",
     "questionTemplateId": "5f8fd56e62b35b077416f171",
     "type": 1,
     "subQuestions": [
       {
         "question": "AA",
         "answer": "test",
         "questionTemplateSubQuestionId": "5f8fd57e62b35b077416f172",
         "isAnswerMandatory": false,
         "type": 0
       }
     ]
   }
 ]
}