An unqued list of all possible answers is in the left-most frame. Scroll through the list and click on the appropriate answer.

The initial bottom frame will tell you the specimen organ.

You will be notified in the bottom frame id you are correct.

If you are wrong, please try again.

Also in the notification information, is the option to see the correct answer.

To navagate through the unknowns click on next to move [Forward], or [Previous] to go backwards.