Question: who plays liam on season 8 of shameless
[{'answer': 'Christian Isaiah', 'provenance': [{'wikipedia_id': '42286485', 'title': 'List of Shameless (American TV series) characters', 'start_paragraph_id': 72, 'start_character': 34, 'end_paragraph_id': 72, 'end_character': 50, 'bleu_score': 1.0, 'section': 'Section::::Gallagher family.:Liam Gallagher.\n'}]}]