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
Neonatal thymectomy leads to - 
Select and explain. 
A. Decreased size of germinal center, B. Decreased size of paracoical areas, C. Increased antibody production by B cells, D. Increased bone marrow production of lymphocytes
B: Decreased size of paracoical areas
Answer: B: Decreased size of paracoical areas 
Explanation: Thymectomy in neonates results in a modest but significant decrease in T-lymphocyte levels, but there is no compromise in immune function.T-cells origin from paracoical areas Reff: www.mayoclinic.com