Question: how many asian countries qualified in world cup 2018
[{'answer': '5', 'provenance': [{'wikipedia_id': '39033698', 'title': 'Asian nations at the FIFA World Cup', 'start_paragraph_id': 31, 'start_character': 49, 'end_paragraph_id': 31, 'end_character': 50, 'bleu_score': 1.0, 'section': 'Section::::Competitive record.:1938: The first Asian nation at the World Cup.\n'}]}]