Input: Read this: TB infection begins when the mycobacteria reach the pulmonary alveoli, where they invade and replicate within endosomes of alveolar macrophages. Macrophages identify the bacterium as foreign and attempt to eliminate it by phagocytosis. During this process, the bacterium is enveloped by the macrophage and stored temporarily in a membrane-bound vesicle called a phagosome. The phagosome then combines with a lysosome to create a phagolysosome. In the phagolysosome, the cell attempts to use reactive oxygen species and acid to kill the bacterium. However, M. tuberculosis has a thick, waxy mycolic acid capsule that protects it from these toxic substances. M. tuberculosis is able to reproduce inside the macrophage and will eventually kill the immune cell.
Question: What envelopes the macrophage?

Output: unanswerable


Input: Read this: One wave of the population boom ended abruptly in the mid-1980s, as oil prices fell precipitously. The space industry also suffered in 1986 after the Space Shuttle Challenger disintegrated shortly after launch. There was a cutback in some activities for a period. In the late 1980s, the city's economy suffered from the nationwide recession. After the early 1990s recession, Houston made efforts to diversify its economy by focusing on aerospace and health care/biotechnology, and reduced its dependence on the petroleum industry. Since the increase of oil prices in the 2000s, the petroleum industry has again increased its share of the local economy.
Question: What did Houston focus on after the 1990s recession to improve its economy?

Output: aerospace and health care


Input: Read this: The scholarly term for research concerning Somalis and Greater Somalia is known as Somali Studies. It consists of several disciplines such as anthropology, sociology, linguistics, historiography and archaeology. The field draws from old Somali chronicles, records and oral literature, in addition to written accounts and traditions about Somalis from explorers and geographers in the Horn of Africa and the Middle East. Since 1980, prominent Somalist scholars from around the world have also gathered annually to hold the International Congress of Somali Studies.
Question: What is the name of the annual gathering of Somali Studies scholars?

Output: the International Congress of Somali Studies


Input: Read this: The United Kingdom has traditionally been governed as a unitary state by the Westminster Parliament in London. Instead of adopting a federal model, the UK has relied on gradual devolution to decentralise political power. Devolution in the UK began with the Government of Ireland Act 1914 which granted home rule to Ireland as a constituent country of the former United Kingdom of Great Britain and Ireland. Following the partition of Ireland in 1921 which saw the creation of the sovereign Irish Free State (which eventually evolved into the modern day Republic of Ireland), Northern Ireland retained its devolved government through the Parliament of Northern Ireland, the only part of the UK to have such a body at this time. This body was suspended in 1972 and Northern Ireland was governed by direct rule during the period of conflict known as The Troubles.
Question: When did revolution in the UK begin?

Output:
unanswerable