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
A contusion can be differentiated from postmoem hypostasis by doing: 
Select and explain. 
A. Diaphanous test, B. Picard's test, C. Incision test, D. Gettler's test
C: Incision test
Answer: C: Incision test 
Explanation: In hypostasis, on incision blood is seen blood vessels, which can be easily washed away. Subcutaneous tissues are pale. In contusion, the incision shows extravasation of blood into the surrounding tissues which is firmly clotted and cannot be washed by gentle stream of water. Subcutaneous tissues are deep reddish- black. Ref: The Essentials of Forensic Medicine and Toxicology by K S Narayan Reddy, 27th edition, Page 163.