This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pancreas, Subject name: Pathology
[{'content': 'Marker for pancreatic non-functional neuro endocrine tumor (PNET) is? \nSelect and explain. \nA. Chromogranin-A, B. CD100, C. CEA, D. PSA', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans is 'a' i.e. Chromogranin-A o Chromogranin-A (CgA) is a glycoprotein used commonly as a tumor marker in histopathology but also has elevated circulating levels in patients with both functional and non-functional PNETs.o Other markers for PNETs - pancreatic polypeptide (PPP), pancreastatin, and neuron-specific enolase (NSE)", 'role': 'assistant'}]