Question: who is the head of state of spain
[{'answer': 'Felipe VI', 'provenance': [{'wikipedia_id': '20141693', 'title': 'List of heads of state of Spain', 'start_paragraph_id': 37, 'start_character': 42, 'end_paragraph_id': 37, 'end_character': 51, 'bleu_score': 1.0, 'section': 'Section::::Kingdom of Spain (1975–present).:House of Bourbon (1975–present; third restoration).\n'}]}]