This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiration, Subject name: Pathology
Carcinoid tumor develops from: 
Select and explain. 
A. Enterochromaffm cells, B. Neuroectoderm, C. J cells, D. Goblet cells
A: Enterochromaffm cells
Answer: A: Enterochromaffm cells 
Explanation: Ans. (a) Enterochromaffin cells(Ref: R 9th/pg 719-720)Carcinoid tumor develops from Enterochromaffin cells which contains neuroendocrine hormones.