Question: who was cast as alex in the big chill
[{'answer': 'Kevin Costner', 'provenance': [{'wikipedia_id': '545795', 'title': 'The Big Chill (film)', 'start_paragraph_id': 1, 'start_character': 356, 'end_paragraph_id': 1, 'end_character': 369, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '545795', 'title': 'The Big Chill (film)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 428, 'bleu_score': 0.7605875301672, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1207046544223056037}, 'section': 'Section::::Abstract.'}]}]