Question: who plays nurse gilbert in call the midwife
[{'answer': 'Charlotte Ritchie', 'provenance': [{'wikipedia_id': '8550458', 'title': 'Charlotte Ritchie', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]