This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mechanical Injuries, Subject name: Forensic Medicine
Friction burn on the skin indicates that 
Select and explain. 
A. Person dragged on the road, B. Ligature crushing the epithelium, C. Cloth covering the skin, D. Pointed object passing across the skin
C: Cloth covering the skin
Answer: C: Cloth covering the skin 
Explanation: Friction burn: Extensive, superficial, reddened excoriated area minimal or no linear mark Occurs when the skin is covered by clothing or the person is dragged on smooth surface (eg. on a marble floor) Brush burn: Graze abrasion involving wider area such as the back, caused by violent rubbing against a surface, as in dragging along over the ground. In an abrasion caused by a tangential force, the direction of the force can be determined by epidermal tags.