Question: who is a in season 2 of pll
[{'answer': 'Mona', 'provenance': [{'wikipedia_id': '31262738', 'title': 'Pretty Little Liars (season 2)', 'start_paragraph_id': 8, 'start_character': 297, 'end_paragraph_id': 8, 'end_character': 301, 'bleu_score': 1.0, 'section': 'Section::::Overview.\n'}]}, {'provenance': [{'wikipedia_id': '31262738', 'title': 'Pretty Little Liars (season 2)', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 692, 'bleu_score': 0.9844346099707091, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15325054694713831808}, 'section': 'Section::::Overview.\n'}]}]