---
type: "sdc-page"
title: "SDC: StructureDefinition-sdc-questionnaire-answerOptionsToggleExpression-intro"
source: "sdc/input/pagecontent/StructureDefinition-sdc-questionnaire-answerOptionsToggleExpression-intro.xml"
---
# SDC: StructureDefinition-sdc-questionnaire-answerOptionsToggleExpression-intro

Additional details on the use of this extension can be found on the [Form Behavior](/sdc-behavior#answerOptionToggleExpression) page. For information on how `answerOptionToggleExpression` is used to conditionally enable or disable specific answer options, refer to the [Expressions page - answerOptionToggleExpression](/sdc-expressions#answerOptionToggleExpression) section.