Problem: Punjab, Pakistan:

The Punjabis followed a diverse plethora of faiths, mainly comprising Hinduism[citation needed] , when the Muslim Umayyad army led by Muhammad bin Qasim conquered Sindh and Southern Punjab in 712, by defeating Raja Dahir. The Umayyad Caliphate was the second Islamic caliphate established after the death of Muhammad. It was ruled by the Umayyad dynasty, whose name derives from Umayya ibn Abd Shams, the great-grandfather of the first Umayyad caliph. Although the Umayyad family originally came from the city of Mecca, their capital was Damascus. Muhammad bin Qasim was the first to bring message of Islam to the population of Punjab.[citation needed] Punjab was part of different Muslim Empires consisting of Afghans and Turkic peoples in co-operation with local Punjabi tribes and others.[citation needed] In the 11th century, during the reign of Mahmud of Ghazni, the province became an important centre with Lahore as its second capital[citation needed] of the Ghaznavid Empire based out of Afghanistan. The Punjab region became predominantly Muslim due to missionary Sufi saints whose dargahs dot the landscape of Punjab region.

Who led the Umayyad army?
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A: Muhammad bin Qasim


Problem: Railway electrification system:

Central station electricity can often be generated with higher efficiency than a mobile engine/generator. While the efficiency of power plant generation and diesel locomotive generation are roughly the same in the nominal regime, diesel motors decrease in efficiency in non-nominal regimes at low power  while if an electric power plant needs to generate less power it will shut down its least efficient generators, thereby increasing efficiency. The electric train can save energy (as compared to diesel) by regenerative braking and by not needing to consume energy by idling as diesel locomotives do when stopped or coasting. However, electric rolling stock may run cooling blowers when stopped or coasting, thus consuming energy.

What can often be generated with a lower efficiency?
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A: unanswerable


Problem: Indigenous peoples of the Americas:

The development of writing is counted among the many achievements and innovations of pre-Columbian American cultures. Independent from the development of writing in other areas of the world, the Mesoamerican region produced several indigenous writing systems beginning in the 1st millennium BCE. What may be the earliest-known example in the Americas of an extensive text thought to be writing is by the Cascajal Block. The Olmec hieroglyphs tablet has been indirectly dated from ceramic shards found in the same context to approximately 900 BCE, around the time that Olmec occupation of San Lorenzo Tenochtitlán began to wane.

What was one of the many achievements of the American cultures?
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A: development of writing


Problem: Washington University in St. Louis:

The Washington University School of Medicine, founded in 1891, is highly regarded as one of the world's leading centers for medical research and training. The School ranks first in the nation in student selectivity. Among its many recent initiatives, The Genome Center at Washington University (directed by Richard K. Wilson) played a leading role in the Human Genome Project, having contributed 25% of the finished sequence. The School pioneered bedside teaching and led in the transformation of empirical knowledge into scientific medicine. The medical school partners with St. Louis Children's Hospital and Barnes-Jewish Hospital (part of BJC HealthCare), where all physicians are members of the school's faculty.

When was the Washington University School of Medicine founded?
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A:
1891