Question: who is the character at the end of the avengers
[{'answer': 'Thanos', 'provenance': [{'wikipedia_id': '701741', 'title': 'Thanos', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 6, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]