Question: who refuted the theory of pangenesis with his classic experiment on mice tails
[{'answer': 'August Friedrich Leopold Weismann', 'provenance': [{'wikipedia_id': '46846', 'title': 'August Weismann', 'start_paragraph_id': 1, 'start_character': 5, 'end_paragraph_id': 1, 'end_character': 38, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '46846', 'title': 'August Weismann', 'start_paragraph_id': 1, 'start_character': 5, 'end_paragraph_id': 1, 'end_character': 348, 'bleu_score': 0.9104031973315161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10534626423599157117}, 'section': 'Section::::Abstract.'}]}]