Question: who has the most goals in el clasico history
[{'answer': 'Lionel Messi', 'provenance': [{'wikipedia_id': '9977483', 'title': 'El Clásico', 'start_paragraph_id': 31, 'start_character': 98, 'end_paragraph_id': 31, 'end_character': 110, 'bleu_score': 1.0, 'section': 'Section::::Rivalry.:Recent issues.\n'}]}]