This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Regional injuries, Subject name: Forensic Medicine
Fracture ala signature is 
Select and explain. 
A. Gutter fracture, B. Depressed fracture, C. Ring fracture, D. Sutural separation
B: Depressed fracture
Answer: B: Depressed fracture 
Explanation: Depressed fracture(Fracture ala signature):When a poion of fractured bone is driven inwards to a distance equivalent to the thickness of the skull table *Heavy weapon with a small striking surface Ex:- Hammer, stone, chopper * Due to local deformation of skull. * It is also called 'fracture ala signature' (signature fracture), as the shape often points towards the shape of the offending weapon. Gutter fracture: seen in oblique bullet wounds Ring fracture- Fracture around the foramen magnum