user: Question: Who won when V. A. Muthiah was the runner-up?
Columns: ['Constituency', 'Winner', 'Party', 'Margin', 'Runner-up a', 'Party a']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Madras North', 'Krishnan Manoharan', 'DMK', 61334.0, 'S. C. C. A. Pillai', 'INC']
SQL:

assistant: SELECT "Winner" FROM "Table" WHERE "Runner-up a" = 'V. A. Muthiah';