Question: when did they stop using lead solder in plumbing
[{'answer': 'after World War II', 'provenance': [{'wikipedia_id': '43982', 'title': 'Plumbing', 'start_paragraph_id': 9, 'start_character': 51, 'end_paragraph_id': 9, 'end_character': 69, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '43982', 'title': 'Plumbing', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 225, 'bleu_score': 0.9493253852526031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11761743962011414543}, 'section': 'Section::::History.\n'}]}]