instruction:
In this task, you are given a question and a context passage. You have to answer the question based on the given passage.
question:
What does every plane have?, Context: Grey-box testing (American spelling: gray-box testing) involves having knowledge of internal data structures and algorithms for purposes of designing tests, while executing those tests at the user, or black-box level. The tester is not required to have full access to the software's source code.[not in citation given] Manipulating input data and formatting output do not qualify as grey-box, because the input and output are clearly outside of the "black box" that we are calling the system under test. This distinction is particularly important when conducting integration testing between two modules of code written by two different developers, where only the interfaces are exposed for test.
answer:
black box


question:
Where was the Sugauli Treaty negotiated?, Context: The aggressive policies of Lord Wellesley and the Marquis of Hastings led to the Company gaining control of all India (except for the Punjab and Sindh), and some part of the then kingdom of Nepal under the Sugauli Treaty. The Indian Princes had become vassals of the Company. But the expense of wars leading to the total control of India strained the Company's finances. The Company was forced to petition Parliament for assistance. This was the background to the Charter Act of 1813 which, among other things:
answer:
Sugauli


question:
What happened in the 77th year of the 19th century?, Context: Symbiosis (from Greek σύν "together" and βίωσις "living") is close and often long-term interaction between two different biological species. In 1877 Albert Bernhard Frank used the word symbiosis (which previously had been used to depict people living together in community) to describe the mutualistic relationship in lichens. In 1879, the German mycologist Heinrich Anton de Bary defined it as "the living together of unlike organisms."
answer:
Albert Bernhard Frank used the word symbiosis (which previously had been used to depict people living together in community) to describe the mutualistic relationship in lichens