Question: what is the top part of an e cig called
[{'answer': 'mouthpiece', 'provenance': [{'wikipedia_id': '46734540', 'title': 'Construction of electronic cigarettes', 'start_paragraph_id': 1, 'start_character': 153, 'end_paragraph_id': 1, 'end_character': 163, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]