sorry can't help. I don't think many people would have got it either as no one got them all right - the top score was 95. I only managed to get 90 right!
Smouse: I didn't do this quiz, but I'm guessing that the logic behind the answer is:
I is the abbreviation for Iodine. Iodine is essential for efficient functioning of the thyroid, so I suppose it could be likened to something containing (a pod) iodine.