Question: who plays teenage ethan in a dog's purpose
[{'answer': 'KJ Apa', 'provenance': [{'wikipedia_id': '48359710', 'title': "A Dog's Purpose (film)", 'start_paragraph_id': 1, 'start_character': 283, 'end_paragraph_id': 1, 'end_character': 289, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '48359710', 'title': "A Dog's Purpose (film)", 'start_paragraph_id': 17, 'start_character': 0, 'end_paragraph_id': 17, 'end_character': 46, 'bleu_score': 0.6803749333171201, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4868359851545487997}, 'section': 'Section::::Cast.\n'}]}]