user: ### NOW ANSWER:
Question: What is the D 42 when the D 50 is D 31?
Columns: ['D 50', 'D 49', 'D 48', 'D 47', 'D 46', 'D 45', 'D 44', 'D 43', 'D 42', 'D 41']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['D 11', 'D 12', 'D 13', 'D 14', 'D 15', 'D 16', 'D 17', 'D 18', 'D 19', 'D 20']
SQL:

assistant: SELECT "D 42" FROM "Table" WHERE "D 50" = 'D 31';