Question: how many episodes is there in star trek discovery
[{'answer': '15', 'provenance': [{'wikipedia_id': '48442701', 'title': 'Star Trek: Discovery', 'start_paragraph_id': 2, 'start_character': 281, 'end_paragraph_id': 2, 'end_character': 283, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '48442701', 'title': 'Star Trek: Discovery', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 409, 'bleu_score': 0.891788949662028, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5980276618933556830}, 'section': 'Section::::Abstract.'}]}]