This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intravenous Anesthetic Agents, Subject name: Anaesthesia
All true about fospropofol except:- 
Select and explain. 
A. It is water soluble product that is metabolized in vivo to Propofol, B. It has slower onset than Propofol, C. It has slower recovery than Propofol, D. It also causes pain on injection line Propofol
D: It also causes pain on injection line Propofol
Answer: D: It also causes pain on injection line Propofol 
Explanation: Fospropofol is pro drug of propofol which is water soluble and does not cause pain on injection. Fospropofol has a slower onset and slower recovery than propofol. It is a water-soluble prodrug of propofol and is metabolized (hydrolysed) to propofol, phosphate, and formaldehyde. Fospropofol is advantageous since it is not associated with pain on injection. Due to its slower onset of sedation, it is associated with a lower incidence of hypotension, respiratory depression, apnea and loss of airway patency.