Question: how many countries are members of the british commonwealth
[{'answer': '53 member states', 'provenance': [{'wikipedia_id': '21175158', 'title': 'Commonwealth of Nations', 'start_paragraph_id': 1, 'start_character': 95, 'end_paragraph_id': 1, 'end_character': 111, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]