Question: who plays cheng in the karate kid 2010
[{'answer': 'Zhenwei Wang', 'provenance': [{'wikipedia_id': '23524192', 'title': 'The Karate Kid (2010 film)', 'start_paragraph_id': 2, 'start_character': 493, 'end_paragraph_id': 2, 'end_character': 505, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]