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Ehrlich's approach of systematically varying the chemical structure of synthetic compounds and measuring the effects of these changes on biological activity was pursued broadly by industrial scientists, including Bayer scientists Josef Klarer, Fritz Mietzsch, and Gerhard Domagk. This work, also based in the testing of compounds available from the German dye industry, led to the development of Prontosil, the first representative of the sulfonamide class of antibiotics. Compared to arsphenamine, the sulfonamides had a broader spectrum of activity and were far less toxic, rendering them useful for infections caused by pathogens such as streptococci. In 1939, Domagk received the Nobel Prize in Medicine for this discovery. Nonetheless, the dramatic decrease in deaths from infectious diseases that occurred prior to World War II was primarily the result of improved public health measures such as clean water and less crowded housing, and the impact of anti-infective drugs and vaccines was significant mainly after World War II.

Anti-infective drugs became more prominent after what war?
Answer: World War II

Problem: 18th Street has a local subway station at the crossing with Seventh Avenue, served by the 1 2 trains on the IRT Broadway Seventh Avenue Line. There used to be an 18th Street station on the IRT Lexington Avenue Line at the crossing with Park Avenue South.
Which train line do the 1 2 trains serve?
The answer is the following: IRT Broadway Seventh Avenue Line

The process of making beer is known as brewing. A dedicated building for the making of beer is called a brewery, though beer can be made in the home and has been for much of its history. A company that makes beer is called either a brewery or a brewing company. Beer made on a domestic scale for non-commercial reasons is classified as homebrewing regardless of where it is made, though most homebrewed beer is made in the home. Brewing beer is subject to legislation and taxation in developed countries, which from the late 19th century largely restricted brewing to a commercial operation only. However, the UK government relaxed legislation in 1963, followed by Australia in 1972 and the US in 1978, allowing homebrewing to become a popular hobby.
What is the process of making beer called?
brewing

Input: Ottoman Empire
Ottoman Turkish was the official language of the Empire. It was an Oghuz Turkic language highly influenced by Persian and Arabic. The Ottomans had several influential languages: Turkish, spoken by the majority of the people in Anatolia and by the majority of Muslims of the Balkans except in Albania and Bosnia; Persian, only spoken by the educated; Arabic, spoken mainly in Arabia, North Africa, Iraq, Kuwait, the Levant and parts of the Horn of Africa; and Somali throughout the Horn of Africa. In the last two centuries, usage of these became limited, though, and specific: Persian served mainly as a literary language for the educated, while Arabic was used for religious rites.

What language was used for religious uses in the Empire?
Output: Arabic

Input: Article: As of the census of 2000, there were 197,790 people, 84,549 households, and 43,627 families residing in the city. The population density was 3,292.6 people per square mile (1,271.3/km). There were 92,282 housing units at an average density of 1,536.2 per square mile (593.1/km). The racial makeup of the city was 38.3% White, 57.2% African American, 0.2% Native American, 1.3% Asian, 0.1% Pacific Islander, 1.5% from other races, and 1.5% from two or more races. Hispanic or Latino of any race were 2.6% of the population.

Now answer this question: As of 2000, how many people lived in Richmond per square kilometer?

Output: 1,271.3

Problem: In females, changes in the primary sex characteristics involve growth of the uterus, vagina, and other aspects of the reproductive system. Menarche, the beginning of menstruation, is a relatively late development which follows a long series of hormonal changes. Generally, a girl is not fully fertile until several years after menarche, as regular ovulation follows menarche by about two years. Unlike males, therefore, females usually appear physically mature before they are capable of becoming pregnant.
Do males or females appear physically mature before they are capable of reproduction?
The answer is the following:
females