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: Anaesthesia
Which of the following anesthetic agent does not cause hypotension on injection? 
Select and explain. 
A. Propofol, B. Ketamine, C. Halothane, D. Thiopentone
B: Ketamine
Answer: B: Ketamine 
Explanation: Ketamine, sold under the brand name Ketalar among others, is a medication mainly used for starting and maintaining anesthesia. It induces a trance-like state while providing pain relief, sedation, and memory loss.