Question: who plays isaac in the fault in our stars
[{'answer': 'Nat Wolff', 'provenance': [{'wikipedia_id': '39513921', 'title': 'The Fault in Our Stars (film)', 'start_paragraph_id': 1, 'start_character': 223, 'end_paragraph_id': 1, 'end_character': 232, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '39513921', 'title': 'The Fault in Our Stars (film)', 'start_paragraph_id': 13, 'start_character': 0, 'end_paragraph_id': 13, 'end_character': 53, 'bleu_score': 0.725979529115477, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9330230274312080792}, 'section': 'Section::::Cast.\n'}]}]