Question: what year does the movie alpha take place
[{'answer': '20,000 years in the past'}, {'provenance': [{'wikipedia_id': '50546927', 'title': 'Alpha (film)', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 344, 'bleu_score': 0.791195230067528, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18113602513533041055}, 'section': 'Section::::Plot.\n'}]}]