Question: Siberian-Urals Aluminium Company comprises 19 businesses involved in the production of a chemical compound that naturally in what crystalline polymorphic phase?
Sentence (from "Bharat Aluminium Company"): BALCO was incorporated in the year 1965 as a Public Sector Undertaking (PSU) and it was the Public sector until 2001, when it was taken over by Vedanta Resources, a company listed on the London Stock Exchange.
Relevant evidence: No