This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Anatomy
Blow back phenomenon seen in 
Select and explain. 
A. Hard contact entrance wound, B. Light contact shot, C. Close shot, D. Intermediate shot
A: Hard contact entrance wound
Answer: A: Hard contact entrance wound 
Explanation: Blow back phenomenon in hard contact: This is most frequently seen in gunshot wounds on the head where the hot expanding gases forced back between the scalp and skull are released by creating tears in the scalp. The margins will be eveed due to gases coming out under pressure. Sometimes, due to negative pressure tissue fragments may be drawn into the barrel and outside called black spatter. Ref: FORENSIC MEDICINE AND TOXICOLOGY Dr PC IGNATIUS THIRD EDITION PAGE 148