Question: who did mark put on the block on big brother
[{'answer': 'Jason', 'provenance': [{'wikipedia_id': '51296550', 'title': 'Big Brother 19 (American season)', 'start_paragraph_id': 39, 'start_character': 19, 'end_paragraph_id': 39, 'end_character': 24, 'bleu_score': 1.0, 'section': 'Section::::Controversies and criticisms.\n'}]}]