Question: when was the world council of churches formed
[{'answer': '1948', 'provenance': [{'wikipedia_id': '46639', 'title': 'World Council of Churches', 'start_paragraph_id': 1, 'start_character': 98, 'end_paragraph_id': 1, 'end_character': 102, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '46639', 'title': 'World Council of Churches', 'start_paragraph_id': 1, 'start_character': 4, 'end_paragraph_id': 1, 'end_character': 704, 'bleu_score': 0.842988829442129, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2433850049171674788}, 'section': 'Section::::Abstract.'}]}]