Question: what is an example of an internal stimulus
[{'answer': 'Homeostatic imbalances', 'provenance': [{'wikipedia_id': '569399', 'title': 'Stimulus (physiology)', 'start_paragraph_id': 4, 'start_character': 11, 'end_paragraph_id': 4, 'end_character': 33, 'bleu_score': 1.0, 'section': 'Section::::Types.:Internal.\n'}]}, {'provenance': [{'wikipedia_id': '569399', 'title': 'Stimulus (physiology)', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 878, 'bleu_score': 0.9583181468235451, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 497697137080678818}, 'section': 'Section::::Types.:Internal.:Homeostatic imbalances.\n'}]}]