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
Which of the following is the first sign that appear in hemorrhagic shock? 
Select and explain. 
A. Hypotension, B. Tachycardia, C. Hypertension, D. Syncope
B: Tachycardia
Answer: B: Tachycardia 
Explanation: None