which means annotation_id? #4

thanks for your amazing work!
about the annotations(tifa_v1.0_question_answers.json),I want to ask:
1.Did you annotate DSG　from coco2014 or 2017? "coco_val_id"?but I cannot find the according number in val_instance2017.json or train_instance2017.json
2.which number means coco anno_id?
{
"id": "coco_435097",
"caption": "Some very big furry brown bears in a big grass field.",
"question": "is this a grass field?",
"choices": [
"yes",
"no"
],
"answer": "yes",
"element_type": "location",
"element": "grass field",
"coco_val_id": "471450"
},