This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pediatrics
Grisel&;s syndrome is 
Select and explain. 
A. Glucosaminidase deficiency, B. Atlanto-axial joint dislocation, C. Hexosaminidase deficiency, D. L4-L5 displacement
B: Atlanto-axial joint dislocation
Answer: B: Atlanto-axial joint dislocation 
Explanation: Grisel's syndromeSpontaneous subluxation of the atlantoaxial joint following peri-pharyngeal inflammation is known as Grisel's syndrome Children are most frequently affected and classically have toicollis associated with neck stiffness or pain upon neck movement(Refer: Nelson's Textbook of Pediatrics, SAE, 1st edition, pg no. 3297, 3298)