Question: who is the a leader in pretty little liars
[{'answer': 'Mona Vanderwaal', 'provenance': [{'wikipedia_id': '38061693', 'title': 'A (Pretty Little Liars)', 'start_paragraph_id': 2, 'start_character': 24, 'end_paragraph_id': 2, 'end_character': 39, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '38061693', 'title': 'A (Pretty Little Liars)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 806, 'bleu_score': 0.90038033551032, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9214762508600202468}, 'section': 'Section::::Abstract.'}]}]