Question: who proposed every person has specific blood group
[{'answer': 'Czech serologist Jan Janský', 'provenance': [{'wikipedia_id': '1586721', 'title': 'ABO blood group system', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 27, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}]