Question: What is the bowling average of the leading wicket-taker in the 1956–57 Quaid-e-Azam Trophy competition?
Sentence (from "1956–57 Quaid-e-Azam Trophy"): All matches at the tournament, played from 25 December 1956 to 8 March 1957, were accorded first-class status, with the group stage matches played over three days, the semi-finals over five days, and the final over six days.
Relevant evidence: No