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: Surgery
Thymectomy causes - 
Select and explain. 
A. Failure of rejection of transplanted organs, B. Myastheina gravis, C. Autoimmune disorders, D. None of the above
A: Failure of rejection of transplanted organs
Answer: A: Failure of rejection of transplanted organs 
Explanation: • In adult life, thymectomy has no demonstrable effect on antibody response or upon homograft survival.
• However, it has been shown that thymectomy in adult mice, combined with total body irradiation, can result in homograft tolerance of a high degree.
• This finding suggests that the thymus gland may resume its perceptor function in adult life under circumstances in which there is temporary suppression of the lymphopoietic system.