Name the most ceiling temperature for very extra high
{'header': ['Maximum Ceiling Temperature', 'Temperature Rating', 'Temperature Classification', 'Color Code (with Fusible Link)', 'Glass Bulb Color'], 'page_title': 'Fire sprinkler', 'page_id': '', 'types': ['text', 'text', 'text', 'text', 'text'], 'id': '1-1538516-1', 'section_title': 'Operation', 'caption': 'Operation', 'rows': [['100°F / 38°C', '135-170°F / 57-77°C', 'Ordinary', 'Uncolored or Black', 'Orange (135°F) or Red (155°F)'], ['150°F / 66°C', '175-225°F / 79-107°C', 'Intermediate', 'White', 'Yellow (175°F) or Green (200°F)'], ['225°F / 107°C', '250-300°F / 121-149°C', 'High', 'Blue', 'Blue'], ['300°F / 149°C', '325-375°F / 163-191°C', 'Extra High', 'Red', 'Purple'], ['375°F / 191°C', '400-475°F / 204-246°C', 'Very Extra High', 'Green', 'Black'], ['475°F / 246°C', '500-575°F / 260-302°C', 'Ultra High', 'Orange', 'Black']], 'name': 'table_1538516_1'}