TASK DEFINITION: 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.
PROBLEM: "Toy" and "toe" are two orthologs of the PAX6 gene in Drosophila named for their influence on the development of these structures. In insects and millipedes, these structures are made of clusters of hexagonal ommatidia, and rhodopsin is a pigment found in these organs. The(*) hyaloid canal passes through the vitreous humor in this organ, and rods and cones are specialized neurons found in the retina in this organ. For 10 points, name this organ in which the iris controls the passage of light through the pupil and toward the lens.

SOLUTION: Social Science

PROBLEM: After allying with the khan of Chagatai and taking part in campaigns in Transoxania, this ruler would lose a "muddy battle" against Ilyas Khodja, despite fighting alongside brother-in-law Husayn of Balkh. Becoming the head of the Barlas upon the death of Tughluk, this man annihilated Tokhtamysh and the Golden Horde at the Battle of the Terek River before he overwhelmed Sultan Mehmud's forces in seizing the Delhi Sultanate. Prior to his death and ultimate succession by Shah Rukh while planning an invasion of China, he defeated the Turks at the Battle of Ankara and captured Bayezid I. FTP, name this Mongol military leader who ruled in Central Asia during the 14th century from his capital of Samarkand.

SOLUTION: History

PROBLEM: In a material with this property, the remanence refers to its magnitude in the absence of a driving force, while coercivity measures how strong a field is needed to remove this property. Its lack of retraceability is noted by a hysteresis loop, and this phenomenon can be attributed to the unfilled energy levels in the 3d level of certain elements. The susceptibility of materials possessing this property can be determined by the Curie-Weiss law beyond a specific point. It is a result of permanent unpaired dipoles within domains that line up with an imposed magnetic field due to long range ordering. Once materials exhibiting this property surpass the Curie temperature, they tend to behave as paramagnets. FTP, name this form of magnetism common to particular metals, most notably observed in nickel, cobalt, and iron.

SOLUTION:
Science