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
Block veebrae are seen in ? 
Select and explain. 
A. Pagets disease, B. Leukemia, C. TB, D. Klippel - Feil syndrome
D: Klippel - Feil syndrome
Answer: D: Klippel - Feil syndrome 
Explanation: Ans. is i.e., Klippel - Feil syndrome A block veebra is a type of veebral anomaly where there is a failure of separation of two or more adjacent veebral bodies Associations There is a frequent association with hemiveebrae / absent veebra above or below block level, posterior element fusion Fusion of multiple cervical veebral bodies is also seen in Klippel-Feil syndrome and VACTREL anamoly.