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: Ophthalmology
Most common cause of fracture of roof of orbit 
Select and explain. 
A. Blow on back of head, B. Blow on parietal bone, C. Blow on the forehead, D. Blow on the upper jaw
C: Blow on the forehead
Answer: C: Blow on the forehead 
Explanation: "Orbital roof fracture should be suspected in any child presenting with blunt injury to the brow or forehead with subsequent development of a hematoma of the upper lid in the hours following injury ". — Pediatric ophthalmology