Which of the following academic, cultural, or scientific categories is not contemplated for the Nobel Prize?

Alfred Bernhard Nobel (Stockholm, Oct. 21, 1833 - San Remo, Dec. 10, 1896) was a Swedish chemist, engineer, writer, inventor, and manufacturer of weapons, famous mainly for the invention of dynamite and for creating the awards that bear his name. Nobel was the owner of Bofors, a company that produced iron and steel and manufactured cannons and other armaments in large-scale. He registered 355 patents during his life and currently, his name survives in several companies, such as Dynamit Nobel and AkzoNobel.

Each year six Nobel Prizes are awarded, one in each of the following categories: Literature, Physics, Chemistry, Peace, Economics, and Psychology and Medicine. Strangely enough, Mathematics is off this list. The reason for this distinct absence has been the subject of much speculation. One of the most common and unfounded reasons why Nobel decided not to award Mathematics a prize would have to do with a woman whom he would have pleaded to be his wife or lover. She would have turned him down at the expense of a famous mathematician. There is no historical evidence to support such a claim. Firstly, Mr. Nobel never married, and besides, there are more credible reasons why there is no Nobel Prize in Mathematics. Perhaps the most valid of these is the simple fact that Nobel did not attach the duly importance to Mathematics because he did not consider it a practical science from which humanity could benefit (the main reason for the creation of the Nobel Foundation).