Input: London
London was the world's largest city from about 1831 to 1925. London's overcrowded conditions led to cholera epidemics, claiming 14,000 lives in 1848, and 6,000 in 1866. Rising traffic congestion led to the creation of the world's first local urban rail network. The Metropolitan Board of Works oversaw infrastructure expansion in the capital and some of the surrounding counties; it was abolished in 1889 when the London County Council was created out of those areas of the counties surrounding the capital. London was bombed by the Germans during the First World War while during the Second World War, the Blitz and other bombings by the German Luftwaffe, killed over 30,000 Londoners and destroyed large tracts of housing and other buildings across the city. Immediately after the war, the 1948 Summer Olympics were held at the original Wembley Stadium, at a time when London had barely recovered from the war.

Who bombed London in both World War I and World War II?
Output: the Germans

Input: Copper
The alloy of copper and nickel, called cupronickel, is used in low-denomination coins, often for the outer cladding. The US 5-cent coin called a nickel consists of 75% copper and 25% nickel and has a homogeneous composition. The alloy consisting of 90% copper and 10% nickel is remarkable for its resistance to corrosion and is used in various parts that are exposed to seawater. Alloys of copper with aluminium (about 7%) have a pleasant golden color and are used in decorations. Some lead-free solders consist of tin alloyed with a small proportion of copper and other metals.

What is the metal composition of a US nickel?
Output: 75% copper and 25% nickel

Input: Gene
Genes can acquire mutations in their sequence, leading to different variants, known as alleles, in the population. These alleles encode slightly different versions of a protein, which cause different phenotype traits. Colloquial usage of the term "having a gene" (e.g., "good genes," "hair colour gene") typically refers to having a different allele of the gene. Genes evolve due to natural selection or survival of the fittest of the alleles.

What do mutations in a gene sequence lead to?
Output: different variants, known as alleles

Input: Nanjing
Traditionally Nanjing's nightlife was mostly centered around Nanjing Fuzimiao (Confucius Temple) area along the Qinhuai River, where night markets, restaurants and pubs thrived. Boating at night in the river was a main attraction of the city. Thus, one can see the statues of the famous teachers and educators of the past not too far from those of the courtesans who educated the young men in the other arts.

Where have Nanjing's after-hours activities typically been located?
Output:
around Nanjing Fuzimiao (Confucius Temple) area along the Qinhuai River