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.

Ex Input:
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.

Ex Output:
When was the Polio vaccine created?

Ex Input:
Goodman, now disconnected from Marvel, set up a new company called Seaboard Periodicals in 1974, reviving Marvel's old Atlas name for a new Atlas Comics line, but this lasted only a year and a half. In the mid-1970s a decline of the newsstand distribution network affected Marvel. Cult hits such as Howard the Duck fell victim to the distribution problems, with some titles reporting low sales when in fact the first specialty comic book stores resold them at a later date.[citation needed] But by the end of the decade, Marvel's fortunes were reviving, thanks to the rise of direct market distributionselling through those same comics-specialty stores instead of newsstands.

Ex Output:
What new venture did Marvel's founder begin after leaving the company in the 1970s?

Ex Input:
Bermuda was colonised by the English as an extension of Virginia and has long had close ties with the US Atlantic Seaboard and Canadian Maritimes as well as the UK. It had a history of African slavery, although Britain abolished it decades before the US. Since the 20th century, there has been considerable immigration to Bermuda from the West Indies, as well as continued immigration from Portuguese Atlantic islands. Unlike immigrants from British colonies in the West Indies, the latter immigrants have had greater difficulty in becoming permanent residents as they lacked British citizenship, mostly spoke no English, and required renewal of work permits to remain beyond an initial period. From the 1950s onwards, Bermuda relaxed its immigration laws, allowing increased immigration from Britain and Canada. Some Black politicians accused the government of using this device to counter the West Indian immigration of previous decades.

Ex Output:
Why did the English originally colonize Bermuda?