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
Period of onset in tetanus refers to the time between- 
Select and explain. 
A. First injury to spasm, B. First symptom to spasm, C. First spasm to death, D. Trismus to laryngeal spasm
B: First symptom to spasm
Answer: B: First symptom to spasm 
Explanation: None