This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
[{'content': 'Which of the following is false regarding frontal sinusitis \nSelect and explain. \nA. Pain shows periodicity, B. Most common sinus involved in infants and children, C. Pain is referred to as office headache, D. Tenderness is present just above the medial canthus of eye', 'role': 'user'}, {'content': "Answer: B \nExplanation: Clinical features of frontal sinusitis:\n\nA frontal headache: showing periodicity and tenderness.\xa0\nOedema of upper eyelids with suffused conjunctiva and photophobia.\nNasal discharge: a vertical streak of mucopus is seen high up in the anterior part of middle meatus\n\xa0X-ray: opacity of affected sinus seen. Both Waters' and lateral views should be taken.\nCT scan is preferred modality.", 'role': 'assistant'}]