Question: who played young derek hale in season 4
[{'answer': 'Ian Michael Nelson', 'provenance': [{'wikipedia_id': '40824535', 'title': 'Ian Nelson (actor, born 1995)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '40824535', 'title': 'Ian Nelson (actor, born 1995)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 171, 'bleu_score': 0.541928106741243, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17153571402725685641}, 'section': 'Section::::Abstract.'}]}]