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
Posterolateral Anconeus triangle is formed by all, except 
Select and explain. 
A. Head of the radius, B. Medical epicondyl, C. Lateral epicondyl, D. Olecrenon
B: Medical epicondyl
Answer: B: Medical epicondyl 
Explanation: None