Question: who is the founder of khan academy of hugli popular free online education platform
[{'answer': 'Sal Khan', 'provenance': [{'wikipedia_id': '25222200', 'title': 'Khan Academy', 'start_paragraph_id': 4, 'start_character': 183, 'end_paragraph_id': 4, 'end_character': 191, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '25222200', 'title': 'Khan Academy', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 487, 'bleu_score': 0.8600254228221461, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10425733998912873821}, 'section': 'Section::::History.\n'}]}]