This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Adrenal Cortex and Medulla, 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: Ans. is 'a' i.e, Small cell carcinoma of lung Ectopic ACTH is produced byo Small cell carcinoma of lung (most common)o Carcinoid tumorso Medullary Carcinoma of thyroido Islet cell tumors of pancrease", 'role': 'assistant'}]