Question: when was the biltmore house opened to the public
[{'answer': 'March 1930', 'provenance': [{'wikipedia_id': '801578', 'title': 'Biltmore Estate', 'start_paragraph_id': 7, 'start_character': 145, 'end_paragraph_id': 7, 'end_character': 155, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '801578', 'title': 'Biltmore Estate', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 871, 'bleu_score': 0.9868845362499331, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12576062336170425543}, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '801578', 'title': 'Biltmore Estate', 'section': 'Section::::History.\n', 'start_paragraph_id': 7, 'end_paragraph_id': 7, 'meta': {'evidence_span': ["In an attempt to bolster the estate's financial situation during the Great Depression, Cornelia and her husband opened Biltmore to the public in March 1930 at the request of the City of Asheville, which hoped the attraction would revitalize the area with tourism.", "In an attempt to bolster the estate's financial situation during the Great Depression, Cornelia and her husband opened Biltmore to the public in March 1930", "In an attempt to bolster the estate's financial situation during the Great Depression, Cornelia and her husband opened Biltmore to the public in March 1930 at the request of the City of Asheville, which hoped the attraction would revitalize the area with tourism. Biltmore closed during World War II and in 1942, 62 paintings and 17 sculptures were moved to the estate by train from the National Gallery of Art in Washington, D.C. to protect them in the event of an attack on the United States. The Music Room on the first floor was never finished, so it was used for storage until 1944, when the possibility of an attack became more remote. Among the works stored were the Gilbert Stuart portrait of George Washington and works by Rembrandt, Raphael, and Anthony van Dyck. David Finley, the gallery director, was a friend of Edith Vanderbilt and had stayed at the estate."]}}]}]