Question: where does the ulna articulate with the humerus
[{'answer': 'olecranon fossa', 'provenance': [{'wikipedia_id': '210294', 'title': 'Ulna', 'start_paragraph_id': 4, 'start_character': 113, 'end_paragraph_id': 4, 'end_character': 128, 'bleu_score': 1.0, 'section': 'Section::::Structure.\n'}]}, {'provenance': [{'wikipedia_id': '210294', 'title': 'Ulna', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 337, 'bleu_score': 0.9669306597086381, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1656843417154320489}, 'section': 'Section::::Structure.\n'}]}]