Question: who has played in the most mlb all star games
[{'answer': 'Hank Aaron', 'provenance': [{'wikipedia_id': '7344694', 'title': 'Major League Baseball All-Star Game records', 'start_paragraph_id': 4, 'start_character': 12, 'end_paragraph_id': 4, 'end_character': 22, 'bleu_score': 1.0, 'section': 'Section::::All-Star Game appearance record.\n'}]}]