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: Surgery
A 4 year old child suffered from a fall on outstretched hand. X rays revealed a fracture with the fracture line at the physes with a small metaphyseal fragment.There was no epiphyseal fracture. What type of injury by Salter Harris Classification is this ? 
Select and explain. 
A. I, B. II, C. III, D. IV
B: II
Answer: B: II 
Explanation: Answer- B. IIType II : The fracture involves the physis and a triangle of metaphyseal bone (Thurston Holland sign).This is the commonest type of epiphyseal injury.