Question: who played edward murrow in goodnight and goodluck
[{'answer': 'David Strathairn', 'provenance': [{'wikipedia_id': '2663129', 'title': 'Good Night, and Good Luck', 'start_paragraph_id': 1, 'start_character': 100, 'end_paragraph_id': 1, 'end_character': 116, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2663129', 'title': 'Good Night, and Good Luck', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 111, 'bleu_score': 0.8852140475440831, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6249389471743489955}, 'section': 'Section::::Main cast.\n'}]}]