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
Calcification of intervertebral disc is seen in – a) Goutb) Rheumatoid c) Alkaptonuriad) Psoriasis 
Select and explain. 
A. ac, B. bc, C. ad, D. b
A: ac
Answer: A: ac 
Explanation: Alkaptonuria (oochronosis) and gout can cause intravertebral disc calcification.