I have a long page (form), where the user has to return to the place he
left last time, or where in that page a question has not been answered.

Example:

Tell me the German word for: Your answer:

1. dog Hund
2. cat Katze
3. rose
4. car Auto


in the example the third one has not been answered, by returning to that
page the display start nearby "3. rose".

bye

Ronald