Question: what is the full form of ph. d
[{'answer': 'Doctor of Philosophy', 'provenance': [{'wikipedia_id': '21031297', 'title': 'Doctor of Philosophy', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Philosophiae Doctor', 'provenance': [{'wikipedia_id': '21031297', 'title': 'Doctor of Philosophy', 'start_paragraph_id': 7, 'start_character': 82, 'end_paragraph_id': 7, 'end_character': 101, 'bleu_score': 1.0, 'section': 'Section::::Terminology.\n'}]}]