Input: Read this: There are two types of transistors, which have slight differences in how they are used in a circuit. A bipolar transistor has terminals labeled base, collector, and emitter. A small current at the base terminal (that is, flowing between the base and the emitter) can control or switch a much larger current between the collector and emitter terminals. For a field-effect transistor, the terminals are labeled gate, source, and drain, and a voltage at the gate can control a current between source and drain.
Question: How many types of transistors are there?

Output: two


Input: Read this: The Ubaid period is marked by a distinctive style of fine quality painted pottery which spread throughout Mesopotamia and the Persian Gulf. During this time, the first settlement in southern Mesopotamia was established at Eridu (Cuneiform: NUN.KI), c. 5300 BC, by farmers who brought with them the Hadji Muhammed culture, which first pioneered irrigation agriculture. It appears that this culture was derived from the Samarran culture from northern Mesopotamia. It is not known whether or not these were the actual Sumerians who are identified with the later Uruk culture. Eridu remained an important religious center when it was gradually surpassed in size by the nearby city of Uruk. The story of the passing of the me (gifts of civilization) to Inanna, goddess of Uruk and of love and war, by Enki, god of wisdom and chief god of Eridu, may reflect this shift in hegemony.
Question: What city became the new religious center after Eridu?

Output: unanswerable


Input: Read this: Other important criteria throughout history are that great powers should have enough influence to be included in discussions of political and diplomatic questions of the day, and have influence on the final outcome and resolution. Historically, when major political questions were addressed, several great powers met to discuss them. Before the era of groups like the United Nations, participants of such meetings were not officially named, but were decided based on their great power status. These were conferences which settled important questions based on major historical events. This might mean deciding the political resolution of various geographical and nationalist claims following a major conflict, or other contexts.
Question: What criteria should groups like the UN have?

Output: unanswerable


Input: Read this: State schools are generally seen as equivalent in quality of education to private-sector institutions. However, the value of a state high-school diploma is limited by the fact that the grades obtained account for only around 25% of the final grade for each topic, with the remaining 75% assigned by the teacher during the semester, in a minimally transparent way. Cypriot universities (like universities in Greece) ignore high school grades almost entirely for admissions purposes. While a high-school diploma is mandatory for university attendance, admissions are decided almost exclusively on the basis of scores at centrally administered university entrance examinations that all university candidates are required to take.
Question: What percentage do grades obtained account for in a students final grade?

Output:
25%