This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Plastic & Reconstructive Surgery, Subject name: Surgery
Organ transplant in twin - 
Select and explain. 
A. Isograft, B. Allograft, C. Autograft, D. Xenograft
A: Isograft
Answer: A: Isograft 
Explanation: Ans. is 'a' i.e., Isograft