You will be given a definition of a task first, then some input of the task.
In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.

Article: The vitamins are named by letters of the alphabet . Vitamin A is needed by the eyes. There is Vitamin A in milk, butter, and green vegetables. It can be kept by the body. Vitamin B cannot be kept. It must be supplied all the time by some of the food we eat. Vitamin C is very important to the body. Without it men's teeth become loose and their arms and legs get weak. Lemons , oranges and tomatoes have Vitamin C in them. Vitamin D is the sun vitamin. We get it in milk and eggs and from sunlight on our skin . There are other Vitamins, but these A, B, C and D, are the most important.
Answer: Vitamin A ,B,Cand D
Output:
There are many kinds of vitamins, the most important of which are _ .