Question: where does atropine block the release of acetylcholine
[{'answer': 'muscarinic receptors', 'provenance': [{'wikipedia_id': '145159', 'title': 'Atropine', 'start_paragraph_id': 17, 'start_character': 118, 'end_paragraph_id': 17, 'end_character': 138, 'bleu_score': 1.0, 'section': 'Section::::Medical uses.:Poisonings.\n'}]}, {'provenance': [{'wikipedia_id': '145159', 'title': 'Atropine', 'start_paragraph_id': 17, 'start_character': 0, 'end_paragraph_id': 17, 'end_character': 600, 'bleu_score': 0.930573633705965, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11036958309828966535}, 'section': 'Section::::Medical uses.:Poisonings.\n'}]}]