Question: who is the head a in pretty little liars
[{'answer': 'CeCe Drake', 'provenance': [{'wikipedia_id': '38061693', 'title': 'A (Pretty Little Liars)', 'start_paragraph_id': 2, 'start_character': 71, 'end_paragraph_id': 2, 'end_character': 81, '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': 16570909137851642847}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '38061693', 'title': 'A (Pretty Little Liars)', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16570909137851642847}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '35152431', 'title': 'Vanessa Ray', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Vanessa Ray (née Liptak; born June 24, 1981) is an American actress and singer. She is known for her role on "Pretty Little Liars" as CeCe Drake (Charlotte DiLaurentis), Jenny on the legal drama series "Suits", Teri Ciccone on "As the World Turns", and Officer Edit "Eddie" Janko Reagan on "Blue Bloods". Ray earned her Actor\'s Equity card while performing the role of Rusty and singing "Let\'s Hear It For the Boy" in the musical', 'Vanessa Ray (née Liptak; born June 24, 1981) is an American actress and singer. She is known for her role on "Pretty Little Liars" as CeCe Drake (Charlotte DiLaurentis), Jenny on the legal drama series "Suits", Teri Ciccone on "As the World Turns", and Officer Edit "Eddie" Janko Reagan on "Blue Bloods".']}}]}, {'provenance': [{'wikipedia_id': '38061693', 'title': 'A (Pretty Little Liars)', 'section': 'Section::::Disguises.:Red Coat.\n', 'start_paragraph_id': 59, 'end_paragraph_id': 59, 'meta': {'evidence_span': ['over the girls. They are: Red Coat is a disguise used by two members of the A-Team. CeCe Drake took on the disguise to lead the A-Team and go out in public, while she hired Sara Harvey to act as a decoy whenever she couldn\'t sport the disguise in her assignments. The Black Widow is a previously anonymous character who attended detective Darren Wilden\'s funeral in "\'A\' Is for A-l-i-v-e". The disguise is all black clothing', "They are: Red Coat is a disguise used by two members of the A-Team. CeCe Drake took on the disguise to lead the A-Team and go out in public, while she hired Sara Harvey to act as a decoy whenever she couldn't sport the disguise in her assignments.", "They are: Red Coat is a disguise used by two members of the A-Team. CeCe Drake took on the disguise to lead the A-Team and go out in public, while she hired Sara Harvey to act as a decoy whenever she couldn't sport the disguise in her assignments."]}}]}]