This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cerebrovascular Diseases, Subject name: Surgery
Panda sign: 
Select and explain. 
A. Unilateral & sign of anterior cranial fossa fracture, B. Bilateral & sign of anterior cranial fossa fracture, C. Unilateral & sign of posterior cranial fossa fracture, D. Bilateral & sign of posterior cranial fossa fracture
B: Bilateral & sign of anterior cranial fossa fracture
Answer: B: Bilateral & sign of anterior cranial fossa fracture 
Explanation: Periorbital Ecchymosis/ Racoon Eyes / Panda sign: Anterior Cranial Fossa Fracture - Usually B/L. Longitudinal (A) and transverse (B) fractures of petrous pyramid of temporal bone, and anterior basal skull fracture (C) "Panda bear" or "raccoon" sign due to leakage of blood from anterior fossa into periorbital tissues, Absence of conjunctival injection differentiates fracture from direct eye trauma.