Question: who was painted the paintings during the pink period
[{'answer': 'Pablo Picasso', 'provenance': [{'wikipedia_id': '2291620', 'title': "Picasso's Rose Period", 'start_paragraph_id': 1, 'start_character': 95, 'end_paragraph_id': 1, 'end_character': 108, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2291620', 'title': "Picasso's Rose Period", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 575, 'bleu_score': 0.979054689945215, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12114116514528595908}, 'section': 'Section::::Abstract.'}]}]