This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal System, Subject name: Radiology
In lead poisoning lead deposition is seen on a radiograph at? 
Select and explain. 
A. Epiphyseal region, B. Metaphyseal region, C. Diaphyseal region, D. Any of the above
B: Metaphyseal region
Answer: B: Metaphyseal region 
Explanation: Ans BLead lines are caused by increased calcification due to disrupted metabolism in the growing bones, become wider as the duration of lead exposure increases. Metaphysis is the most metabolically active part of the bone hence seen at this site.