Question: In which year did Jack Pickersgill serve as Cabinet member for Lester B. Pearson?
Sentence (from "Jack Pickersgill"): John Whitney "Jack" Pickersgill, {'1': ", '2': ", '3': ", '4': "} (June 23, 1905 – November 14, 1997) was a Canadian civil servant and politician.
Relevant evidence: No