Question: at what point in menstrual cycle is estrogen highest
[{'answer': 'preovulatory stage', 'provenance': [{'wikipedia_id': '88003', 'title': 'Menstrual cycle', 'start_paragraph_id': 28, 'start_character': 125, 'end_paragraph_id': 28, 'end_character': 143, 'bleu_score': 1.0, 'section': 'Section::::Health effects.:Mood and behavior.\n'}]}, {'provenance': [{'wikipedia_id': '88003', 'title': 'Menstrual cycle', 'start_paragraph_id': 28, 'start_character': 0, 'end_paragraph_id': 28, 'end_character': 506, 'bleu_score': 0.97451705556073, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16228738100488375692}, 'section': 'Section::::Health effects.:Mood and behavior.\n'}]}]