Question: where are red giant stars found in the h-r diagram
[{'answer': 'the red - giant branch', 'provenance': [{'wikipedia_id': '21245707', 'title': 'Red giant', 'start_paragraph_id': 24, 'start_character': 213, 'end_paragraph_id': 24, 'end_character': 234, 'bleu_score': 1.0, 'section': 'Section::::Planets.:Prospects for habitability.\n'}]}]