Translate the following question to SQL: What is the sex of the candidate who had the highest unsure rate?

Schema: CREATE TABLE candidate (
    Candidate_ID INT   PRIMARY KEY,
    People_ID INT,
    Poll_Source TEXT,
    Date TEXT,
    Support_rate REAL,
    Consider_rate REAL,
    Oppose_rate REAL,
    Unsure_rate REAL,
    UNIQUE (Candidate_ID),
    FOREIGN KEY (People_ID) REFERENCES people(People_ID)
);

CREATE TABLE people (
    People_ID INT   PRIMARY KEY,
    Sex TEXT,
    Name TEXT,
    Date_of_Birth TEXT,
    Height REAL,
    Weight REAL,
    UNIQUE (People_ID)
);
user
SELECT t1.sex FROM people AS t1 JOIN candidate AS t2 ON t1.people_id  =  t2.people_id GROUP BY t1.sex ORDER BY avg(t2.unsure_rate) DESC LIMIT 1
assistant