Question: In what political party is Lady Dorothy Macmillan's husband?
Sentence (from "Harold Macmillan"): Maurice Harold Macmillan, 1st Earl of Stockton, {'1': ", '2': ", '3': ", '4': "} (10 February 1894 – 29 December 1986) was a British statesman of the Conservative Party who served as Prime Minister of the United Kingdom from 1957 to 1963.
Relevant evidence: Yes