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: Surgery
19 year old boy had a history of fall on out stretched hand while playing. He developed slight radial side pain and tenderness. On examination pressure along the axis of thumb is painful and x rays are normal. 
Select and explain. 
A. Fracture lower end radius, B. Wrist sprain, C. Scaphoid fracture, D. Perilunate dislocation
C: Scaphoid fracture
Answer: C: Scaphoid fracture 
Explanation: C i.e. Scaphoid fracture