Question: what problem does damage to broca area cause
[{'answer': 'aphasia', 'provenance': [{'wikipedia_id': '40166', 'title': "Broca's area", 'start_paragraph_id': 2, 'start_character': 376, 'end_paragraph_id': 2, 'end_character': 383, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '40166', 'title': "Broca's area", 'start_paragraph_id': 33, 'start_character': 0, 'end_paragraph_id': 33, 'end_character': 1180, 'bleu_score': 0.9896100372834851, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13556860563072367338}, 'section': 'Section::::Clinical significance.:Expressive aphasia vs. other aphasias.\n'}]}]