user: Question: What is every candidate for the Cardiff Central constituency?
Columns: ['Constituency', 'Candidate', 'Affiliation', 'Result - votes', 'Result - %', 'Loss/gain']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Coventry North East', 'Dave Nellist', 'Socialist Party (stood as Socialist Alternative)', 1592.0, '3.7%', '-1.2%']
SQL:

assistant: SELECT "Candidate" FROM "Table" WHERE "Constituency" = 'Cardiff Central';