Question: Waylon Smithers appeared an episode of The Simpsons that originally aired on January 21, 1990, and that has Homer promoted to what position?
{'answer': 'Nuclear Safety Inspector', 'supporting_facts': [['Waylon Smithers', 1], ["Homer's Odyssey (The Simpsons)", 0], ["Homer's Odyssey (The Simpsons)", 1], ["Homer's Odyssey (The Simpsons)", 2]]}