Question: which element exists as a diatomic molecule at stp
[{'answer': 'hydrogen ( H )', 'provenance': [{'wikipedia_id': '7938', 'title': 'Diatomic molecule', 'start_paragraph_id': 12, 'start_character': 275, 'end_paragraph_id': 12, 'end_character': 290, 'bleu_score': 1.0, 'section': 'Section::::Occurrence.\n'}]}, {'answer': 'nitrogen ( N )', 'provenance': [{'wikipedia_id': '7938', 'title': 'Diatomic molecule', 'start_paragraph_id': 21, 'start_character': 185, 'end_paragraph_id': 21, 'end_character': 198, 'bleu_score': 1.0, 'section': 'Section::::Excited electronic states.\n'}]}, {'answer': 'oxygen ( O )', 'provenance': [{'wikipedia_id': '7938', 'title': 'Diatomic molecule', 'start_paragraph_id': 2, 'start_character': 214, 'end_paragraph_id': 2, 'end_character': 225, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'fluorine ( F )', 'provenance': [{'wikipedia_id': '7938', 'title': 'Diatomic molecule', 'start_paragraph_id': 2, 'start_character': 226, 'end_paragraph_id': 2, 'end_character': 239, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'chlorine ( Cl )', 'provenance': [{'wikipedia_id': '7938', 'title': 'Diatomic molecule', 'start_paragraph_id': 2, 'start_character': 244, 'end_paragraph_id': 2, 'end_character': 258, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '7938', 'title': 'Diatomic molecule', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 256, 'bleu_score': 0.9517713210466091, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10989633762715076992}, 'section': 'Section::::Abstract.'}]}]