user: Question: What is the birth date of the member with the Defining characteristic of Pink hair?
Columns: ['Name', 'Real Name', 'Birthdate', 'Costume Role', 'Defining characteristics']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Daishi - Lead Vocals', 'Daishi Kajinaga (梶永大士)', 'February 5, 1976', '"The Hero"', 'Shortest band member']
SQL:

assistant: SELECT "Birthdate" FROM "Table" WHERE "Defining characteristics" = 'Pink hair';