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: Forensic Medicine
Retraction balls' after trauma are seen in: PGI 08, 11; UP 12 
Select and explain. 
A. Brain, B. Spleen, C. Liver, D. Lung
A: Brain
Answer: A: Brain 
Explanation: Ans. Brain