In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Q: With its HM74A receptor, this compounds inhibits the liploysis of adipose tissue, and it is also used to treat a condition associated with aminoaciduria and cerebellar ataxia, which is commonly known as Hartnup disease. Oral ingestion of it leads to vasodilation caused by the release of prostaglandin, which leads to a flushing response. People whose diets are high in maize and millets tend to suffer from a deficiency of it, as leucine can inhibits is biosynthesis from tryptophan. Its deficiency is commonly associated with dermatitis, dementia, and diarrhea, which are commonly called the "three Ds" and nicotinamide dinucleotide, or NAD, is a derivative of this vitamin. For 10 points, identify this vitamin, whose deficiency causes pellagra.
A:
Science