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
Ectopic ACTH production is seen in - 
Select and explain. 
A. Small cell carcinoma is lung, B. Anaplastic carcinoma of lung, C. Squamous cell carcinoma of lung, D. Adenocarcinoma of cerebellum
A: Small cell carcinoma is lung
Answer: A: Small cell carcinoma is lung 
Explanation: 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