Definition: In this task, you are given a context, a subject, a relation, and many options. Based on the context, from the options select the object entity that has the given relation with the subject. Answer with text (not indexes).
Input: Context: Tungsten, also known as wolfram, is a chemical element with symbol W and atomic number 74. The word "tungsten" comes from the Swedish language "tung sten", which directly translates to "heavy stone". Its name in Swedish is "volfram", however, in order to distinguish it from scheelite, which is alternatively named "tungsten" in Swedish., Tungstic acid refers to hydrated forms of tungsten trioxide , WO3 . The simplest form , the monohydrate , is WO3, Tungsten(VI) oxide, also known as tungsten trioxide or tungstic anhydride, WO, is a chemical compound containing oxygen and the transition metal tungsten. It is obtained as an intermediate in the recovery of tungsten from its minerals. Tungsten ores are treated with alkalis to produce WO. Further reaction with carbon or hydrogen gas reduces tungsten trioxide to the pure metal., Hydrogen is a chemical element with chemical symbol H and atomic number 1. With an atomic weight of , hydrogen is the lightest element on the periodic table. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Non-remnant stars are mainly composed of hydrogen in the plasma state. The most common isotope of hydrogen, termed "protium" (name rarely used, symbol H), has one proton and no neutrons., In chemistry, an alkali (from Arabic: "al-qaly" ,  , ashes of the saltwort) is a basic, ionic salt of an alkali metal or alkaline earth metal chemical element. An alkali also can be defined as a base that dissolves in water. A solution of a soluble base has a pH greater than 7.0. The adjective alkaline is commonly, and alkalescent less often, used in English as a synonym for basic, especially for bases soluble in water. This broad use of the term is likely to have come about because alkalis were the first bases known to obey the Arrhenius definition of a base, and they are still among the most common bases., Oxygen is a chemical element with symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table and is a highly reactive nonmetal and oxidizing agent that readily forms oxides with most elements as well as other compounds. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. At standard temperature and pressure, two atoms of the element bind to form dioxygen, a colorless and odorless diatomic gas with the formula . This is an important part of the atmosphere and diatomic oxygen gas constitutes 20.8% of the Earth's atmosphere. Additionally, as oxides the element makes up almost half of the Earth's crust., Carbon (from "coal") is a chemical element with symbol C and atomic number 6. It is nonmetallic and tetravalentmaking four electrons available to form covalent chemical bonds. Three isotopes occur naturally, C and C being stable, while C is a radioactive isotope, decaying with a half-life of about 5,730 years. Carbon is one of the few elements known since antiquity., Subject: tungstic acid, Relation: instance_of, Options: (A) 1 (B) adjective (C) alkali (D) base (E) chemical compound (F) chemical element (G) dioxygen (H) gas (I) hydrogen (J) isotope of hydrogen (K) language (L) mass (M) member (N) name (O) number (P) order (Q) oxide (R) part (S) standard (T) symbol (U) table (V) three (W) two (X) water (Y) word
Output:
chemical compound