Question: who is the inventor of what's app
[{'answer': 'Brian Acton', 'provenance': [{'wikipedia_id': '32058867', 'title': 'WhatsApp', 'start_paragraph_id': 5, 'start_character': 32, 'end_paragraph_id': 5, 'end_character': 43, 'bleu_score': 1.0, 'section': 'Section::::History.:2009–2014.\n'}]}, {'answer': 'Jan Koum', 'provenance': [{'wikipedia_id': '32058867', 'title': 'WhatsApp', 'start_paragraph_id': 5, 'start_character': 48, 'end_paragraph_id': 5, 'end_character': 56, 'bleu_score': 1.0, 'section': 'Section::::History.:2009–2014.\n'}]}]