instruction:
Generate a correct and concise answer for the question based on the words in the context.
question:
Context : ``One of Us, One of Them'' is the third episode of the third season of the NBC science fiction drama series Heroes and thirty-seventh episode overall. 
Question : Which show does One of Us, One of Them appear on?
answer:
Heroes


question:
Context : The GCR Class 1 was a class of steam locomotives designed by John G. Robinson for the Great Central Railway, and introduced to service between December 1912 and 1913. 
Question : What was the year that GCR Class 1 entered service?
answer:
December 1912


question:
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 what year did ESO 3.6 m Telescope enter service?
answer:

1977