Question: what are the 4 majors on the pga tour
[{'answer': 'Masters Tournament', 'provenance': [{'wikipedia_id': '1506950', 'title': "Men's major golf championships", 'start_paragraph_id': 11, 'start_character': 207, 'end_paragraph_id': 11, 'end_character': 225, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'answer': 'PGA Championship', 'provenance': [{'wikipedia_id': '1506950', 'title': "Men's major golf championships", 'start_paragraph_id': 11, 'start_character': 416, 'end_paragraph_id': 11, 'end_character': 432, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'answer': 'U.S. Open', 'provenance': [{'wikipedia_id': '1506950', 'title': "Men's major golf championships", 'start_paragraph_id': 11, 'start_character': 146, 'end_paragraph_id': 11, 'end_character': 155, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'answer': 'The Open Championship', 'provenance': [{'wikipedia_id': '1506950', 'title': "Men's major golf championships", 'start_paragraph_id': 11, 'start_character': 60, 'end_paragraph_id': 11, 'end_character': 81, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}]