Four vitamins are named below. Choose the odd one out: Vitamin A, Vitamin C, Vitamin E, Vitamin K.

Vitamins A, E and K dissolve in fat, so the body can lay up a store of them in the liver and the fatty tissues and draw on it for weeks. Vitamin C dissolves in water, is not stored at all and passes out in the urine, which is why it has to be eaten afresh every day. All four are tempting because they are named by single letters and sold on the same shelf, but the tie among the other three is the fat they dissolve in.