["region:us"]
[{"name": "metadata", "struct": [{"name": "chapter", "dtype": "string"}, {"name": "difficult_degree", "dtype": "int64"}, {"name": "grade", "dtype": "string"}, {"name": "id", "dtype": "string"}, {"name": "idx", "dtype": "int64"}, {"name": "subject", "dtype": "string"}]}, {"name": "question", "dtype": "string"}, {"name": "options", "list": [{"name": "answer", "dtype": "string"}, {"name": "key", "dtype": "string"}]}, {"name": "answer", "struct": [{"name": "answer", "dtype": "string"}, {"name": "key", "dtype": "string"}]}, {"name": "solution", "dtype": "string"}, {"name": "quality", "struct": [{"name": "has_image", "dtype": "bool"}, {"name": "missing_question", "dtype": "bool"}, {"name": "missing_solution", "dtype": "bool"}]}]