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: During the years 1940-1955, the rate of decline in the U.S. death rate accelerated from 2% per year to 8% per year, then returned to the historical rate of 2% per year. The dramatic decline in the immediate post-war years has been attributed to the rapid development of new treatments and vaccines for infectious disease that occurred during these years. Vaccine development continued to accelerate, with the most notable achievement of the period being Jonas Salk's 1954 development of the polio vaccine under the funding of the non-profit National Foundation for Infantile Paralysis. The vaccine process was never patented, but was instead given to pharmaceutical companies to manufacture as a low-cost generic. In 1960 Maurice Hilleman of Merck Sharp & Dohme identified the SV40 virus, which was later shown to cause tumors in many mammalian species. It was later determined that SV40 was present as a contaminant in polio vaccine lots that had been administered to 90% of the children in the United States. The contamination appears to have originated both in the original cell stock and in monkey tissue used for production. In 2004 the United States Cancer Institute announced that it had concluded that SV40 is not associated with cancer in people.

A: When was the Polio vaccine created?
****
Q: John's lack of religious conviction has been noted by contemporary chroniclers and later historians, with some suspecting that John was at best impious, or even atheistic, a very serious issue at the time. Contemporary chroniclers catalogued his various anti-religious habits at length, including his failure to take communion, his blasphemous remarks, and his witty but scandalous jokes about church doctrine, including jokes about the implausibility of the Resurrection. They commented on the paucity of John's charitable donations to the church. Historian Frank McLynn argues that John's early years at Fontevrault, combined with his relatively advanced education, may have turned him against the church. Other historians have been more cautious in interpreting this material, noting that chroniclers also reported John's personal interest in the life of St Wulfstan of Worcester and his friendships with several senior clerics, most especially with Hugh of Lincoln, who was later declared a saint. Financial records show a normal royal household engaged in the usual feasts and pious observances – albeit with many records showing John's offerings to the poor to atone for routinely breaking church rules and guidance. The historian Lewis Warren has argued that the chronicler accounts were subject to considerable bias and the King was "at least conventionally devout," citing his pilgrimages and interest in religious scripture and commentaries.

A: Historians suspected that John was at best what?
****
Q: Broadly speaking, government phonology (or its descendant, strict-CV phonology) has a greater following in the United Kingdom, whereas optimality theory is predominant in the United States.[citation needed]

A:
What followed government phonology?
****