This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
T-cell mature in:(1991) 
Select and explain. 
A. Peyer's patches, B. Lymph node, C. Thymus, D. Bursa of fabricius
C: Thymus
Answer: C: Thymus 
Explanation: Ans: c (Thymus)Ref: Ananthanarayan Micro, 7th ed, p. 123 & 6th ed, p. 117, 115; Fig. 15.4