This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pelvis and Hip injuries, Subject name: Orthopaedics
Which of the following describes grade 2 fracture neck femur? 
Select and explain. 
A. Incomplete fracture, medial trabeculae intact, B. Complete fracture with undisplaced neck, C. Complete fracture with ischemic head, D. Moderate displacement of neck, vascularity damaged
B: Complete fracture with undisplaced neck
Answer: B: Complete fracture with undisplaced neck 
Explanation: REF : MAHESWARI 9TH ED