Question: which world heritage site appears on the flag of cambodia
[{'answer': 'Angkor Wat', 'provenance': [{'wikipedia_id': '448642', 'title': 'Flag of Cambodia', 'start_paragraph_id': 2, 'start_character': 66, 'end_paragraph_id': 2, 'end_character': 76, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]