This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, 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: The interval between first symptom(dysphagia and stiffiness of jaw) to a reflex spasm is called period of onset. If this is less than 48hours,the prognosis is poor and if more than 48hours,prognosis is better. Ref:Manipal manual of surgery,4th edition,pg