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A 2 1/2-year-old boy presents with a severe sore throat, muffled voice and difficulty opening and closing his mouth. On examination, the oropharynx is markedly erythematous without exudates. A soft tissue X-ray of the neck is obtained and shown. What diagnosis is suggested by the film?a. Epiglottitisb. Peritonsillar abscessc. Retropharyngeal abscessd. Tracheitis