Question: what is the name of the area where the femur articulates with the pelvis
[{'answer': 'hip joint', 'provenance': [{'wikipedia_id': '188497', 'title': 'Femur', 'start_paragraph_id': 1, 'start_character': 202, 'end_paragraph_id': 1, 'end_character': 211, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '188497', 'title': 'Femur', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 425, 'bleu_score': 0.5233682125156031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2521713864834892187}, 'section': 'Section::::Abstract.'}]}]