Question: which ventricle is located between the two halves of the thalamus
[{'answer': 'the third ventricle', 'provenance': [{'wikipedia_id': '78227', 'title': 'Thalamus', 'start_paragraph_id': 5, 'start_character': 300, 'end_paragraph_id': 5, 'end_character': 319, 'bleu_score': 1.0, 'section': 'Section::::Anatomy.\n'}]}, {'provenance': [{'wikipedia_id': '78227', 'title': 'Thalamus', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 135, 'bleu_score': 0.5193746422641471, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8003630859222129673}, 'section': 'Section::::Abstract.'}]}]