Question: what does the skin produce in response to sunlight exposure
[{'answer': 'melanin', 'provenance': [{'wikipedia_id': '541488', 'title': 'Sun tanning', 'start_paragraph_id': 3, 'start_character': 70, 'end_paragraph_id': 3, 'end_character': 77, 'bleu_score': 1.0, 'section': 'Section::::Impact on skin health.\n'}]}, {'answer': 'vitamin D', 'provenance': [{'wikipedia_id': '541488', 'title': 'Sun tanning', 'start_paragraph_id': 3, 'start_character': 82, 'end_paragraph_id': 3, 'end_character': 91, 'bleu_score': 1.0, 'section': 'Section::::Impact on skin health.\n'}]}, {'provenance': [{'wikipedia_id': '541488', 'title': 'Sun tanning', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 469, 'bleu_score': 0.92959410412591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16440200119254377807}, 'section': 'Section::::Impact on skin health.\n'}]}]