This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Human identification, Subject name: Forensic Medicine
In Mckern and Stewa maturation score of skeletal age, which of the following epiphyseal union is not used? 
Select and explain. 
A. Humerus - Proximal end, B. Radius - Proximal end, C. Femur - Distal end, D. Iliac crest
B: Radius - Proximal end
Answer: B: Radius - Proximal end 
Explanation: Mckern and Stewa maturation score of skeletal age Humerus - Proximal end and medial epicondyle Radius - Distal end Femur - Head and Distal end Iliac crest. Sacrum--Lateral poion and 3,4th segments. The scoring is given based on the degree of epiphyseal union that is: