Question: what is a special geographic characteristic of central america
[{'answer': 'tropical rain forest', 'provenance': [{'wikipedia_id': '6545069', 'title': 'Geography of North America', 'start_paragraph_id': 26, 'start_character': 126, 'end_paragraph_id': 26, 'end_character': 146, 'bleu_score': 1.0, 'section': 'Section::::Surface and climate.\n'}]}, {'provenance': [{'wikipedia_id': '6545069', 'title': 'Geography of North America', 'start_paragraph_id': 26, 'start_character': 0, 'end_paragraph_id': 26, 'end_character': 610, 'bleu_score': 0.979896933041101, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18072520092602006539}, 'section': 'Section::::Surface and climate.\n'}]}]