Question: who played rudy's friend peter on the cosby show
[{'answer': 'Peter Costa', 'provenance': [{'wikipedia_id': '10885419', 'title': 'Peter Costa (actor)', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 11, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '10885419', 'title': 'Peter Costa (actor)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 276, 'bleu_score': 0.957870874785216, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1720212233120082009}, 'section': 'Section::::Abstract.'}]}]