Question: who was the first european to discover the mississippi river
[{'answer': 'Alonzo Alvarez de Pineda', 'provenance': [{'wikipedia_id': '27919989', 'title': 'Timeline of European exploration', 'start_paragraph_id': 57, 'start_character': 19, 'end_paragraph_id': 57, 'end_character': 43, 'bleu_score': 1.0, 'section': 'Section::::16th century.\n'}]}]