Question: what is the first stage of an embryo
[{'answer': 'germinal stage', 'provenance': [{'wikipedia_id': '12276398', 'title': 'Human embryonic development', 'start_paragraph_id': 1, 'start_character': 578, 'end_paragraph_id': 1, 'end_character': 592, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '12276398', 'title': 'Human embryonic development', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 522, 'bleu_score': 0.976043556018343, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4873947109930843237}, 'section': 'Section::::Abstract.'}]}]