Question: who is the scientist that propounded the bi-lipid molecular layer of cell membrane
[{'answer': 'Evert Gorter', 'provenance': [{'wikipedia_id': '48186455', 'title': 'Membrane models', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 12, 'bleu_score': 1.0, 'section': "Section::::Gorter and Grendel's membrane theory (1920).\n"}]}, {'answer': 'François Grendel', 'provenance': [{'wikipedia_id': '48186455', 'title': 'Membrane models', 'start_paragraph_id': 3, 'start_character': 17, 'end_paragraph_id': 3, 'end_character': 33, 'bleu_score': 1.0, 'section': "Section::::Gorter and Grendel's membrane theory (1920).\n"}]}, {'provenance': [{'wikipedia_id': '48186455', 'title': 'Membrane models', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 1768, 'bleu_score': 0.940892007672781, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1299567510923949821}, 'section': "Section::::Gorter and Grendel's membrane theory (1920).\n"}]}]