This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lung Tumor, Subject name: Pathology
[{'content': 'Neuroendocrine tumor is having which of the following as an immunohistochemical marker? \nSelect and explain. \nA. Cytokeratin, B. Calretin, C. Synaptophysin, D. Carcinoembryonic antigen', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Neuro endocrine tumor markers Chromogranin Synaptophysin Neuron specific enolase Among the various types of lung cancer, small cell carcinoma is the one that is most commonly associated with ectopic hormone production.', 'role': 'assistant'}]