Fracture ala signature is a type of ?

Ans. is 'b' i.e., Depressed fracture of skull Fracture -ala-signature / signature fracture is also known as depressed fracture of skull vault. Depressed fracture (signature fracture or fracture-ala signature) :It caused by a heavy weapon with a small striking surface, e.g. hammer which causes a piece of skull bone to get depressed into the cral cavity.