Question: Stephen Parkinson is a special adviser to a prime minister who leads which party ?
Sentence (from "Theresa May"): Theresa Mary May ( , "née" Brasier ; born 1 October 1956) is a British politician who has served as Prime Minister of the United Kingdom and Leader of the Conservative Party since 2016, the second woman to hold both positions, the first being Margaret Thatcher.
Relevant evidence: Yes