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: Biochemistry
[{'content': 'Which of the following is luminous? \nSelect and explain. \nA. Porphyrin, B. Zymogen, C. Chromatin, D. Albumin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Porphyrins are colored and fluorescent wherase porphyrinogens are colorless.- When porphyrins dissolved in strong mineral acids or in organic solvents are illuminated by ultraviolet light, they emit a strong red fluorescenceQ.- The double bonds joining the pyrrole rings in porphyrin are responsible for characteristic absorption & fluorosence.- Soret band: - The sharp absorption band near 400nm. shown by porphyrin solution (in 5% HC1)- Is characteristic of all porphyrins regardless of the side chain present.', 'role': 'assistant'}]