Question: which planet is 5.5 of earth's mass and has no moon
[{'answer': 'Mercury', 'provenance': [{'wikipedia_id': '839504', 'title': 'List of natural satellites', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 7, 'bleu_score': 1.0, 'section': 'Section::::Moons by primary.\n'}]}, {'provenance': [{'wikipedia_id': '839504', 'title': 'List of natural satellites', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 180, 'bleu_score': 0.80846720196545, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2533238202574114482}, 'section': 'Section::::Moons by primary.\n'}]}]