A 62-year-old man presents with a painful, swollen, red big toe on his left foot, which started suddenly overnight. He has never experienced this before. He drinks 2 pints of beer daily and takes Bendroflumethiazide for hypertension. On examination, the first metatarsophalangeal (MTP) joint is erythematous, warm, swollen, and exquisitely tender to touch. What is the most likely diagnosis?