Question: how many water buffalo are left in the world
[{'answer': 'about 172 million', 'provenance': [{'wikipedia_id': '58708', 'title': 'Water buffalo', 'start_paragraph_id': 33, 'start_character': 49, 'end_paragraph_id': 33, 'end_character': 66, 'bleu_score': 1.0, 'section': 'Section::::Distribution of populations.\n'}]}]