This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2018, Subject name: Dental
[{'content': 'Patients with porphyria are highly sensitive to which wavelength : \nSelect and explain. \nA. 290-320 nm, B. 400-420 nm, C. 320-400 nm, D. 250-290 nm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Porphyrin are excited by visible light with a wavelength between 400 and 410 nm and emit an intense red fluorescence. The released energy reacts with oxygen to produce free radicals and singlet oxygen that damages tissues Mc porphyria - porphyria cutaneatarda (if- Red urine - D/D - myoglobinuria )', 'role': 'assistant'}]