Question: which component of the neuromuscular (myoneural) junction is considered the presynaptic membrane
[{'answer': 'the sarcolemma', 'provenance': [{'wikipedia_id': '681908', 'title': 'Neuromuscular junction', 'start_paragraph_id': 2, 'start_character': 925, 'end_paragraph_id': 2, 'end_character': 939, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]