Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE candidate ( candidate_id number, people_id number, poll_source text, date text, support_rate number, consider_rate number, oppose_rate number, unsure_rate number )
TABLE: CREATE TABLE people ( people_id number, sex text, name text, date_of_birth text, height number, weight number )

### Question ###
which gender got the highest average uncertain ratio.

### Accurate SQL ###

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