user: Question: Who won men's singles when Petya Nedelcheva Diana Dimova won women's doubles and Vladimir Metodiev Krasimir Yankov won men's doubles?
Columns: ['Year', "Men's singles", "Women's singles", "Men's doubles", "Women's doubles", 'Mixed doubles']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1985.0, 'Jeliazko Valkov', 'Diana Koleva', 'Ilko Orechov Nanko Ertchopov', 'Diana Koleva Zlatka Valkanova', 'Jeliazko Valkov Dobrinka Peneva']
SQL:

assistant: SELECT "Men's singles" FROM "Table" WHERE "Women's doubles" = 'Petya Nedelcheva Diana Dimova' AND "Men's doubles" = 'Vladimir Metodiev Krasimir Yankov';