This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Brainstem lesions and blood supply of CNS, Subject name: Anatomy
All of the following statements are true regarding cavernous sinus thrombosis EXCEPT 
Select and explain. 
A. Loss of jaw jerk, B. Inferior ophthalmic vein can spread infection from dangerous area of face, C. Ethmoidal sinusitis is the most common cause, D. Loss of sensation around the eye
A: Loss of jaw jerk
Answer: A: Loss of jaw jerk 
Explanation: Cavernous sinus thrombosis caused by sepsis in the dangerous area of face, in nasal cavities & in paranasal sinuses. Septic emboli carried by superior (more common) or inferior ophthalmic veins into the cavernous sinus. Nervous symptoms - Loss of sensation around the eye due to involvement of V1 and V2 division of Vth nerve. - Involvement of CN III, IV, VI Venous symptoms Edema of eyelids, cornea, root of nose d/o congestion of the orbital veins.