Question: who was the italian god presiding over beginnings and depicted with two faces
[{'answer': 'Janus', 'provenance': [{'wikipedia_id': '159852', 'title': 'Janus', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 5, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '159852', 'title': 'Janus', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 418, 'bleu_score': 0.8735466016740041, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12930178229240935389}, 'section': 'Section::::Abstract.'}]}]