Question: who won hoh on big brother 20 week 4
[{'answer': 'Sam', 'provenance': [{'wikipedia_id': '51356934', 'title': 'Big Brother 20 (American season)', 'start_paragraph_id': 1, 'start_character': 137, 'end_paragraph_id': 1, 'end_character': 140, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]