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
A patient manifests systemic symptoms of pallor and unconsciousness following local anesthesia. The patient is experiencing: 
Select and explain. 
A. CNS depression, B. Syncope, C. Tonic reaction to local anesthesia, D. Allergic response
B: Syncope
Answer: B: Syncope 
Explanation: None