You could use a dropdown formfield for the Yes/No options. Then, wherever you want some conditional content to appear you might use a field coded along the lines of:
{IF{REF Dropdown1}= "Yes" "Conditional content for Yes" "Conditional content for NOT Yes (i.e. the default"}
or:
{IF{REF Dropdown1}= "Yes" "Conditional content for Yes" {IF{REF Dropdown1}= "No" "Conditional content for No" "Conditional content for neither Yes nor No (i.e. the default"}
where Dropdown1 is the dropdown formfield's internal bookmark name.

The conditional content with either construction can include multiple paragraphs, tables and images.

Note: The field brace pairs (i.e. '{ }') for the above example are all created in the document itself, via Ctrl-F9 (Cmd-F9 on a Mac); you can't simply type them or copy & paste them from this message. Nor is it practical to add them via any of the standard Word dialogues. The spaces represented in the field constructions are all required. You will need to apply 'filling in forms' protection for the process to work.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]