Question: in the game left 4 dead what is the name of the big muscular enemy
[{'answer': 'The Tank', 'provenance': [{'wikipedia_id': '8036013', 'title': 'Left 4 Dead', 'start_paragraph_id': 26, 'start_character': 230, 'end_paragraph_id': 26, 'end_character': 238, 'bleu_score': 1.0, 'section': 'Section::::Gameplay.:Infected characters.\n'}]}, {'provenance': [{'wikipedia_id': '8036013', 'title': 'Left 4 Dead', 'start_paragraph_id': 26, 'start_character': 0, 'end_paragraph_id': 26, 'end_character': 534, 'bleu_score': 0.9788329837059241, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17096973667243868181}, 'section': 'Section::::Gameplay.:Infected characters.\n'}]}]