This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolic disorders - 1, Subject name: Orthopaedics
What is the diagnostic radiological finding in skeletal fluorosis? 
Select and explain. 
A. Sclerosis of sacroiliac joint, B. Interosseous membrane ossification, C. Osteosclerosis of veebral body, D. Ossification of ligaments of knee joint
B: Interosseous membrane ossification
Answer: B: Interosseous membrane ossification 
Explanation: Skeletal fluorosis is a bone disease caused by excessive accumulation of fluoride in the bones Osteosclerosis, osteophytosis and ossification of ligamentous and fascial attachments is characteristic of fluorosis and amongst them most impoant is Interosseous membrane ossification.