Conditional logic for the options displayed for single-select and dropdowns#153

Add the ability to show/hide an option from a list of options in Select/Dropdown questions so that some options only appear when certain conditions are met.

For example, if I have a Single Select list of services selection, I want some services to appear only applicable to the client (i.e services related to children in a divorce proceeding would not appear if client said ‘’NO’’ to ‘’Do you have children?’’