Goitre is mostly caused by the lack of what element in the diet?

More Questions:

What drink is sometimes called "the green fairy"?

What cocktail do you get if you add green Creme de Menthe to cognac?

What is the name of Nintendo's first video game console?

In the beer world, what does the abbreviation IBU stand for?

What sign are you if you were born on Valentine’s Day?

Who wrote the opera "Madame Butterfly"?

Which state is located between Maine and Vermont?

What year did Bangladesh declare its independence from Pakistan?

What are the grinding teeth called?

Which is the largest planet in our solar system?

'Staying Alive', the sequel to the movie "Saturday Night Fever', was released what year?

What "Seinfeld" co-creator also provided the voice of George Steinbrenner on the show?

The rock band, Pearl Jam, was formed in what US city?

What 2005 movie stars Ellen Page and Sandra Oh?

Who was the Greek god of sleep?