# Answer

Answers arrive in the [response](/docs/traversal-response) on a [question](/docs/question).  These are the data points that all algorithms require to identify the next question.
```js
{
	"answerId": int,
	"controlChecked": bool,
	"controlType": "string",
	"controlValue": "string",
	"data": {},
	"displayText": "string",
	"explanation": "string",
	"nodeId": int,
	"questionId": int
}
```

AnswerId
: Unique Id of this answer. 

ControlChecked
: A boolean describing the checked state of a `Checkbox` or `Radio` answer.

ControlType
: An enum value, as a string, representing the type of answer. `Checkbox`, `Radio`, `Text`, `Number`, `Date`, and `Hidden`.  

ControlValue
: Value of the input to display in a `Text`, `Number`, or `Date` answer. Values in a `Date` answer will be in [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601) format `YYYY-MM-DD`.

Data
: A JSON object .  This can be used to tell the UI any special requirements, or simply as a system notification.

DisplayText
: Answer text, for example, for radio button labels.

Explanation
: A more in-depth message to the user usually shown as a clickable information icon (:information_source:).

NodeId
: Unique Id of the [node](/docs/node). 

QuestionId
: Unique Id of the [question](/docs/question). 

