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: Orthopaedics
Most common cause of genu valgum in children is - 
Select and explain. 
A. Osteoarthritis, B. Rickets, C. Pager's disease, D. Rheumatoid arthritis
B: Rickets
Answer: B: Rickets 
Explanation: Commonest type of genu valgum is idiopathic.
Amongst the given options, most common cause of genu valgum in children is rickets.
Paget's disease causes genu varum.           
OA and RA are not seen in children.