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
Marker of small cell cancer of lung is: 
Select and explain. 
A. Chromogranin, B. Cytokeratin, C. Desmin, D. Vimentin
A: Chromogranin
Answer: A: Chromogranin 
Explanation: 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