This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
T cells mature in:March 2012 
Select and explain. 
A. Thyroid, B. Tongue, C. Thymus, D. Trachea
C: Thymus
Answer: C: Thymus 
Explanation: Ans: C i.e. ThymusImmunologically incompetent cells which go to the thymus are "preprocessed" there (thymus) and become T cells. The letter T comes from the word thymus.