Compose a new way to ask the same question. The new question must be asking the exact same thing as the original question does. Without any other information, you should be able to tell that the original question and the new question are the same. Preserve bracketed phrases in your new question. You can change the rest of the question provided the above requirements are satisfied. The new question must have a natural, fluent formulation, as if it were composed by a native English speaker. You will be given three pieces of information to help you create better questions. Those are: "Answer": the answer to the question, e.g., "Honolulu". "Answer Type": the type of the answer, e.g., "Location". "Auxiliary Information" is a detailed description of some concepts mentioned in the question, if any.

[Q]: original question: What class of drugs is [Vitamin D]?
answer: bisphosphonate, nicotinic acids, copper absorption inhibitor...
answer type: Drug class.
auxiliary information: Vitamin D refers to a group of fat-soluble secosteroids responsible for enhancing intestinal absorption of calcium, iron, magnesium, phosphate and zinc. In humans, the most important compounds in this group are vitamin D‚ÇÉ and vitamin D‚ÇÇ. Cholecalciferol and ergocalciferol can be ingested from the diet and from supplements. Very few foods contain vitamin D; synthesis of vitamin D in the skin is the major natural source of the vitamin. Dermal synthesis of vitamin D from cholesterol is dependent on sun exposure. Vitamin D from the diet or dermal synthesis from sunlight is biologically inactive; activation requires enzymatic conversion in the liver and kidney. Evidence indicates the synthesis of vitamin D from sun exposure is regulated by a negative feedback loop that prevents toxicity, but because of uncertainty about the cancer risk from sunlight, no recommendations are issued by the Institute of Medicine, for the amount of sun exposure required to meet vitamin D requirements. Accordingly, the Dietary Reference Intake for vitamin D assumes no synthesis occurs and all of a person's vitamin D is from food intake, although that will rarely occur in practice.
[A]: [Vitamin D] is listed in what class of drugs?


[Q]: original question: Which public library is in the library system of [Bradford Public Library]?
answer: bradford public library central library
answer type: Public Library.
[A]: [Bradford Public Library] has which public library in it's library system?


[Q]: original question: What binding format does the first edition of [I Am Legend] use?
answer: paperback
answer type: Book Binding.
auxiliary information: I Am Legend is a 1954 horror fiction novel by American writer Richard Matheson. It was influential in the development of the zombie genre and in popularizing the concept of a worldwide apocalypse due to disease. The novel was a success and was adapted to film as The Last Man on Earth in 1964, as The Omega Man in 1971, and as I Am Legend in 2007, along with a direct-to-video 2007 production capitalizing on that film, I Am Omega. The novel was also the inspiration behind the 1968 film Night of the Living Dead.
[A]:
For the first edition of [I Am Legend] which particular binding format does the book use?