This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Orbit, 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 fractures are very rare as an isolated feature. They are most commonly seen in children following brow trauma. Oxford handbook of Ophthalmology"Fractures of the orbital roof among young children are probably far more common than traditionally has been recognized. There is usually a history of a blow to the brow. Head & neck surgery--otolaryngology By Byron J. Bailey, Jonas T Johnson, Shawn D. Newland 4/e p1346