user: Question: Which PAL M has a PAL I of 50Hz?
Columns: ['NTSC M', 'PAL B,G,H', 'PAL I', 'PAL N', 'PAL M']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['525/60', '625/50', '625/50', '625/50', '525/60']
SQL:

assistant: SELECT "PAL M" FROM "Table" WHERE "PAL I" = '50Hz';