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: Radiology
Reversal of lead foil on X-ray film may appear as: 
Select and explain. 
A. Herring bone, B. Embossed tram track pattern, C. Both 1 and 2, D. None
C: Both 1 and 2
Answer: C: Both 1 and 2 
Explanation: Reversal of lead foil on X-ray film: Herring bone / Embossed tram track pattern.