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
Siffert katz sign seen in 
Select and explain. 
A. Chondromalacia patella, B. Blount's disease, C. CTEV, D. Rocker Bottom foot
B: Blount's disease
Answer: B: Blount's disease 
Explanation: None