Question: what type of tissue makes up the most external skin region
[{'answer': 'stratum corneum', 'provenance': [{'wikipedia_id': '9040547', 'title': 'Human skin', 'start_paragraph_id': 15, 'start_character': 258, 'end_paragraph_id': 15, 'end_character': 273, 'bleu_score': 1.0, 'section': 'Section::::Structure.:Epidermis.:Layers.\n'}]}, {'provenance': [{'wikipedia_id': '9040547', 'title': 'Human skin', 'start_paragraph_id': 15, 'start_character': 0, 'end_paragraph_id': 15, 'end_character': 461, 'bleu_score': 0.972782728923768, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7105388382163941223}, 'section': 'Section::::Structure.:Epidermis.:Layers.\n'}]}]