Question: where did the orcs come from in lotr
[{'answer': 'Arda', 'provenance': [{'wikipedia_id': '248383', 'title': 'Orc (Middle-earth)', 'start_paragraph_id': 69, 'start_character': 241, 'end_paragraph_id': 69, 'end_character': 245, 'bleu_score': 1.0, 'section': 'Section::::The origin of Orcs.:A list of origins, proposed by Tolkien.:Sentient beasts.\n'}]}]