This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.

[Q]: Many applications of silicate glasses derive from their optical transparency, which gives rise to one of silicate glasses' primary uses as window panes. Glass will transmit, reflect and refract light; these qualities can be enhanced by cutting and polishing to make optical lenses, prisms, fine glassware, and optical fibers for high speed data transmission by light. Glass can be colored by adding metallic salts, and can also be painted and printed with vitreous enamels. These qualities have led to the extensive use of glass in the manufacture of art objects and in particular, stained glass windows. Although brittle, silicate glass is extremely durable, and many examples of glass fragments exist from early glass-making cultures. Because glass can be formed or molded into any shape, and also because it is a sterile product, it has been traditionally used for vessels: bowls, vases, bottles, jars and drinking glasses. In its most solid forms it has also been used for paperweights, marbles, and beads. When extruded as glass fiber and matted as glass wool in a way to trap air, it becomes a thermal insulating material, and when these glass fibers are embedded into an organic polymer plastic, they are a key structural reinforcement part of the composite material fiberglass. Some objects historically were so commonly made of silicate glass that they are simply called by the name of the material, such as drinking glasses and reading glasses.
[A]: What ingredient makes glass colorful?


[Q]: Tito became increasingly ill over the course of 1979. During this time Vila Srna was built for his use near Morović in the event of his recovery. On 7 January and again on 11 January 1980, Tito was admitted to the Medical Centre in Ljubljana, the capital city of the SR Slovenia, with circulation problems in his legs. His left leg was amputated soon afterward due to arterial blockages and he died of gangrene at the Medical Centre Ljubljana on 4 May 1980 at 15:05, three days short of his 88th birthday. His funeral drew many world statesmen. Based on the number of attending politicians and state delegations, at the time it was the largest state funeral in history; this concentration of dignitaries would be unmatched until the funeral of Pope John Paul II in 2005 and the memorial service of Nelson Mandela in 2013. Those who attended included four kings, 31 presidents, six princes, 22 prime ministers and 47 ministers of foreign affairs. They came from both sides of the Cold War, from 128 different countries out of 154 UN members at the time.
[A]: During what year did Tito become increasingly ill?


[Q]: The war had removed Bermuda's primary trading partners, the American colonies, from the empire, and dealt a harsh blow to Bermuda's merchant shipping trade. This also suffered due to the deforestation of Bermuda, as well as the advent of metal ships and steam propulsion, for which it did not have raw materials. During the course of the following War of 1812, the primary market for Bermuda's salt disappeared as the Americans developed their own sources. Control of the Turks had passed to the Bahamas in 1819.
[A]:
Who was Bermuda's main trading partner before the war?