Question: who played lou grant in the mary tyler moore show
[{'answer': 'Ed Asner', 'provenance': [{'wikipedia_id': '170943', 'title': 'Lou Grant', 'start_paragraph_id': 1, 'start_character': 47, 'end_paragraph_id': 1, 'end_character': 55, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]