What number is indicated by the Roman numeral "D"?

More Questions:

How many years are in a semicentennial?

What year was the Rubik's Cube invented?

In what 1952 play is Giles Corey "pressed" to death, his last words being "More weight"?

The Thousand Islands are located in what body of water?

Although it's referred to as a "sea', what body of water is actually the largest lake in the world?

In what direction do most cyclones whirl in the Southern Hemisphere?

What material are fingernails made of?

What TV show do Thelma and Louise want to avoid being on?

Bob Eubanks was the original host of what game show where couples competed against each other?

What band would walk 500 miles and 500 more just to fall down at your door?

Who created the TV show "SpongeBob SquarePants"?

What lovestruck Warner Brothers cartoon character often chased a black cat named Penelope?

Which legendary Knight of the Round Table does not appear in the movie "Monty Python and the Holy Grail"?

What explorer was the first to sail around the southern tip of South America, and name it Cape Horn?

In mathematics, which prefix refers to 10 to the power of 21?