[Q]: Extract the answer to the question from the following context. Question: What is an advantage of testing brain function in animals? Context: Another approach to brain function is to examine the consequences of damage to specific brain areas. Even though it is protected by the skull and meninges, surrounded by cerebrospinal fluid, and isolated from the bloodstream by the bloodbrain barrier, the delicate nature of the brain makes it vulnerable to numerous diseases and several types of damage. In humans, the effects of strokes and other types of brain damage have been a key source of information about brain function. Because there is no ability to experimentally control the nature of the damage, however, this information is often difficult to interpret. In animal studies, most commonly involving rats, it is possible to use electrodes or locally injected chemicals to produce precise patterns of damage and then examine the consequences for behavior.
****
[A]: it is possible to use electrodes or locally injected chemicals to produce precise patterns of damage

[Q]: Extract the answer to the question from the following context. Question: Not the first, but the more popular, where is that cemetary? Context: The largest cemetery is the Cementerio del Norte, located in the northern-central part of the city. The Central Cemetery (Spanish: Cementerio central), located in Barrio Sur in the southern area of the city, is one of Uruguay's main cemeteries. It was one of the first cemeteries (in contrast to church graveyards) in the country, founded in 1835 in a time where burials were still carried out by the Catholic Church. It is the burial place of many of the most famous Uruguayans, such as Eduardo Acevedo, Delmira Agustini, Luis Batlle Berres, Jose Batlle y Ordonez, Juan Manuel Blanes, Francois Ducasse, father of Comte de Lautreamont (Isidore Ducasse), Luis Alberto de Herrera, Benito Nardone, Jose Enrique Rodo, and Juan Zorrilla de San Martin.
****
[A]: the northern-central part of the city

[Q]: Extract the answer to the question from the following context. Question: What type of financial burden made nobles easy to control? Context: One of John's principal challenges was acquiring the large sums of money needed for his proposed campaigns to reclaim Normandy. The Angevin kings had three main sources of income available to them, namely revenue from their personal lands, or demesne; money raised through their rights as a feudal lord; and revenue from taxation. Revenue from the royal demesne was inflexible and had been diminishing slowly since the Norman conquest. Matters were not helped by Richard's sale of many royal properties in 1189, and taxation played a much smaller role in royal income than in later centuries. English kings had widespread feudal rights which could be used to generate income, including the scutage system, in which feudal military service was avoided by a cash payment to the king. He derived income from fines, court fees and the sale of charters and other privileges. John intensified his efforts to maximise all possible sources of income, to the extent that he has been described as "avaricious, miserly, extortionate and moneyminded". John also used revenue generation as a way of exerting political control over the barons: debts owed to the crown by the king's favoured supporters might be forgiven; collection of those owed by enemies was more stringently enforced.
****
[A]: debts

[Q]: Extract the answer to the question from the following context. Question: How do we know that life in Mali could be better? Context: Although Mali has enjoyed a reasonably good inter-ethnic relationships based on the long history of coexistence, some hereditary servitude and bondage relationship exist, as well as ethnic tension between settled Songhai and nomadic Tuaregs of the north. Due to a backlash against the northern population after independence, Mali is now in a situation where both groups complain about discrimination on the part of the other group. This conflict also plays a role in the continuing Northern Mali conflict where there is a tension between both Tuaregs and the Malian government, and the Tuaregs and radical Islamists who are trying to establish sharia law.
****
[A]:
some hereditary servitude and bondage relationship exist, as well as ethnic tension between settled Songhai and nomadic Tuaregs of the north