Question: what mediterranean landmark is on spains southern border
[{'answer': 'Rock of Gibraltar', 'provenance': [{'wikipedia_id': '7607314', 'title': 'Gibraltar', 'start_paragraph_id': 1, 'start_character': 195, 'end_paragraph_id': 1, 'end_character': 212, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]