Question: who played the leading role of a stranded astronaut in the 2015 film the martian
[{'answer': 'Matt Damon', 'provenance': [{'wikipedia_id': '43683268', 'title': 'The Martian (film)', 'start_paragraph_id': 1, 'start_character': 81, 'end_paragraph_id': 1, 'end_character': 91, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '43683268', 'title': 'The Martian (film)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 453, 'bleu_score': 0.563887711607958, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11401275393412302724}, 'section': 'Section::::Abstract.'}]}]