Question: who played the holographic doctor on star trek
[{'answer': 'Robert Picardo', 'provenance': [{'wikipedia_id': '508647', 'title': 'Robert Picardo', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 14, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '508647', 'title': 'Robert Picardo', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 485, 'bleu_score': 0.912732825538882, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14623095288328123902}, 'section': 'Section::::Abstract.'}]}]