Adaptive Card
This response is used to add an adaptive card as a Simple Response. The response it used to get an adaptive card for MS-Teams. On drop of the response to drawable conversation area, we get a default adaptive card template in the form:

The form of adaptive card after drop of this response appears the following:

The edit icon in the form opens a modal which shows JSON Editor, card view, Element structure and Element properties.

Try other card button shows, another modal to show other sample:

The rest buttons in modal are self-explanatory. If the card has buttons/JSON has actions, then we get to select how do we want buttons to be treated as entity or intent. The rest flow work same as simple response with or without option.
Validation On Adaptive Card:
- It cannot be the first node.
- It will automatically add a user option response once it is saved with actions.
- Response all ways comes like an adaptive card template.
- If deleted, it will be deleted with user option response and its branches will be disconnected.