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: Ans. is 'b' i.e., First symptom to spasm