Definition: In this task, you will be presented with a text and a pronoun. You should write the name that the pronoun refers to. Position of the pronoun in the text is showed within two "_"s.
Input: On the 30th October 1889 Stephenson sustained a defeat by John McLean (rower), who beat him by three. `` lengths, after a good race, over the same course, in 21min 53sec. For this match Stephenson was backed by Mr Warby, of Sydney, who was _his_ chief supporter for a match for the Championship of New Zealand. <sep>, Pronoun: his

Stephenson