Problem: Extract the answer to the question from the following context. Question: What keeps the balance? Context: In some rare cases, such as with Ethiopia and Qing Dynasty China, the local governments were able to use the treaties to at least mitigate the impact of European colonization. This involved learning the intricacies of European diplomatic customs and then using the treaties to prevent a power from overstepping their agreement or by playing different powers against each other.

A: treaties

Problem: Extract the answer to the question from the following context. Question: What aspect of the academics has changed? Context: Later the emphasis was on classical studies, dominated by Latin and Ancient History, and, for boys with sufficient ability, Classical Greek. From the latter part of the 19th century this curriculum has changed and broadened: for example, there are now more than 100 students of Chinese, which is a non-curriculum course. In the 1970s, there was just one school computer, in a small room attached to the science buildings. It used paper tape to store programs. Today, all boys must have laptop computers, and the school fibre-optic network connects all classrooms and all boys' bedrooms to the internet.

A: emphasis was on classical studies

Problem: Extract the answer to the question from the following context. Question: Other than expenses, what makes TB treatment inconvenient for those receiving it? Context: Tuberculosis is the second-most common cause of death from infectious disease (after those due to HIV/AIDS). The total number of tuberculosis cases has been decreasing since 2005, while new cases have decreased since 2002. China has achieved particularly dramatic progress, with about an 80% reduction in its TB mortality rate between 1990 and 2010. The number of new cases has declined by 17% between 20042014. Tuberculosis is more common in developing countries; about 80% of the population in many Asian and African countries test positive in tuberculin tests, while only 510% of the US population test positive. Hopes of totally controlling the disease have been dramatically dampened because of a number of factors, including the difficulty of developing an effective vaccine, the expensive and time-consuming diagnostic process, the necessity of many months of treatment, the increase in HIV-associated tuberculosis, and the emergence of drug-resistant cases in the 1980s.

A: time-consuming diagnostic process, the necessity of many months of treatment

Problem: Extract the answer to the question from the following context. Question: In 1995, how were the head of government for the boroughs chosen? Context: For administrative purposes, the Federal District is divided into 16 "delegaciones" or boroughs. While not fully equivalent to a municipality, the 16 boroughs have gained significant autonomy, and since 2000 their heads of government are elected directly by plurality (they were previously appointed by the head of government of the Federal District). Given that Mexico City is organized entirely as a Federal District, most of the city services are provided or organized by the Government of the Federal District and not by the boroughs themselves, while in the constituent states these services would be provided by the municipalities. The 16 boroughs of the Federal District with their 2010 populations are:

A:
appointed by the head of government of the Federal District