Question: what 6th period metal is liquid at room temperature
[{'answer': 'Mercury', 'provenance': [{'wikipedia_id': '181556', 'title': 'Period 6 element', 'start_paragraph_id': 63, 'start_character': 11, 'end_paragraph_id': 63, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::d-block elements.:Gold.\n'}]}, {'answer': 'bromine', 'provenance': [{'wikipedia_id': '181556', 'title': 'Period 6 element', 'start_paragraph_id': 64, 'start_character': 349, 'end_paragraph_id': 64, 'end_character': 356, 'bleu_score': 1.0, 'section': 'Section::::d-block elements.:Mercury.\n'}]}, {'provenance': [{'wikipedia_id': '181556', 'title': 'Period 6 element', 'start_paragraph_id': 64, 'start_character': 0, 'end_paragraph_id': 64, 'end_character': 594, 'bleu_score': 0.9343799099351541, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8590401080350458871}, 'section': 'Section::::d-block elements.:Mercury.\n'}]}]