This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'Ectopic ACTH production is seen in- \nSelect and explain. \nA. Small cell carcinoma is lung, B. Anaplastic carcinoma of lung, C. Squamous cell carcinoma of lung, D. Adenocarcinoma of cerebellum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Reference :Robbins basic pathology 9th edition pg no 222:Cushing syn drome arising as a paraneoplastic phenomenon usually is related to ectopic production of ACTH or ACTHlike poly peptides by cancer cells, as occurs in small cell cancers of the lung', 'role': 'assistant'}]