This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiration, Subject name: Pathology
[{'content': 'Marker of small cell cancer of lung is: \nSelect and explain. \nA. Chromogranin, B. Cytokeratin, C. Desmin, D. Vimentin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Chromogranin(Ref: Robbins 9th/pg 717)Electron microscopy of Small cell Carcinoma lung: dense- core neurosecretory granules Q releasing neuroendocrine markers such as chromogranin Q, synaptophysin Q, and CD57 Q, parathormone-related protein Q', 'role': 'assistant'}]