Problem: Text: The quinine was added to the drink as a prophylactic against malaria, since it was originally intended for consumption in tropical areas of South Asia and Africa, where the disease is endemic. Quinine powder was so bitter that British officials stationed in early 19th century India and other tropical posts began mixing the powder with soda and sugar, and a basic tonic water was created. The first commercial tonic water was produced in 1858. The mixed drink gin and tonic also originated in British colonial India, when the British population would mix their medicinal quinine tonic with gin.

Question: does the quinine in tonic water prevent malaria?
A: yes

Problem: Text: There are 92 association football teams in the top four tiers of English football, all of which have a manager, or pair of joint managers, sometimes given the alternative title of head coach. The Premier League and Football Leagues are the only fully professional football leagues in England. The Premier League consists of 20 clubs at the top of the English football league system. The remaining 72 clubs are split into the three divisions of the Football League: the Championship, League One, and League Two.

Question: are there any english managers in the premier league?
A: yes

Problem: Text: To maintain lactation, a dairy cow must be bred and produce calves. Depending on market conditions, the cow may be bred with a ''dairy bull'' or a ''beef bull.'' Female calves (heifers) with dairy breeding may be kept as replacement cows for the dairy herd. If a replacement cow turns out to be a substandard producer of milk, she then goes to market and can be slaughtered for beef. Male calves can either be used later as a breeding bull or sold and used for veal or beef. Dairy farmers usually begin breeding or artificially inseminating heifers around 13 months of age. A cow's gestation period is approximately nine months. Newborn calves are removed from their mothers quickly, usually within three days, as the mother/calf bond intensifies over time and delayed separation can cause extreme stress on both cow and calf.

Question: do dairy cows have to be pregnant to produce milk?
A:
yes