Question: who introduced the use of agar as a solidifier liquid media
[{'answer': 'Walther Hesse', 'provenance': [{'wikipedia_id': '3262', 'title': 'Agar', 'start_paragraph_id': 8, 'start_character': 200, 'end_paragraph_id': 8, 'end_character': 213, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '3262', 'title': 'Agar', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 499, 'bleu_score': 0.9751504244977051, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2213244940762851683}, 'section': 'Section::::History.\n'}]}]