Hairpin shaped eosinophilic structure present in radicular cyst is:
Periapical Cyst 
The cyst lumen may be filled with fluid and cellular debris. On occasion, the lining epithelium may demonstrate linear or arch-shaped calcifications known as Rushton bodies 
Squamous epithelial cyst lining exhibiting numerous irregular and curvilinear Rushton bodies.
Rushton bodies
Russell bodies
Both of the above
None of the above