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
The most important function of epithelioid cells in tuberculosis is: 
Select and explain. 
A. Phagocytosis, B. Secretory, C. Antigenic, D. Healing
B: Secretory
Answer: B: Secretory 
Explanation: Ans. (b) Secretory(Ref: Immunology, 8th edition, by David Male; pg 427)Epithelioid cells are transformed macrophages that have lost their phagocytic function but retained their secretory activity.Epithelioid cells contain numerous endoplasmic reticulum & golgi bodies.They secrete IL10, TNF alpha, TGF beta;