Generate a correct and concise answer for the question based on the words in the context.

[EX Q]: Context : The ESO 3.6 m Telescope is an optical reflecting telescope run by the European Southern Observatory at La Silla Observatory, Chile since 1977, with a clear aperture of about 3.6 metres (140 in) and 8.6 m2 (93 sq ft) area. 
Question : In which year was the service entry date for ESO 3.6 m Telescope?
[EX A]: 1977

[EX Q]: Context : The Winter Hill air disaster occurred on 27 February 1958 when the Silver City Airways Bristol 170 Freighter G-AICS, travelling from the Isle of Man to Manchester, England, crashed into Winter Hill (also known as Rivington Moor) several hundred yards away from the Independent Television Authority's Winter Hill transmitting station. 
Question : The point in time of Winter Hill air disaster was when?
[EX A]: 27 February 1958

[EX Q]: Context : Pennsylvania Hospital is a private, non-profit, 534-bed teaching hospital located in Center City Philadelphia and affiliated with the University of Pennsylvania Health System. 
Question : Which company is the parent company of Pennsylvania Hospital?
[EX A]:
University of Pennsylvania Health System