How many colleges did the player picked 57 attend?
{'header': ['Rnd', 'Pick', 'Player name', 'Position', 'College', 'Height', 'Weight'], 'page_title': '', 'page_id': '', 'types': ['real', 'real', 'text', 'text', 'text', 'text', 'text'], 'id': '1-15017024-2', 'section_title': '', 'caption': '', 'rows': [['1', '1', 'Jake Long', 'Offensive tackle', 'Michigan', '6\' 7"', '315lbs'], ['2', '32', 'Phillip Merling', 'Defensive end', 'Clemson', '6\' 4"', '275lbs'], ['2', '57', 'Chad Henne', 'Quarterback', 'Michigan', '6\' 3"', '228lbs'], ['3', '66', 'Kendall Langford', 'Defensive end', 'Hampton', '6\' 6"', '287lbs'], ['4', '110', 'Shawn Murphy', 'Guard', 'Utah State', '6\' 4"', '314lbs'], ['6', '176', 'Jalen Parmele', 'Running back', 'Toledo', '5\' 11"', '225lbs'], ['6', '195', 'Donald Thomas', 'Guard', 'Connecticut', '6\' 4"', '305lbs'], ['6', '204', 'Lex Hilliard', 'Running back', 'Montana', '5\' 11"', '234lbs']], 'name': 'table_15017024_2'}