This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology - 3, Subject name: Forensic Medicine
The sample taken below is sent for biochemical analysis in? 
Select and explain. 
A. Hydrochloric acid, B. Phenol, C. Formalin, D. Fluoride
D: Fluoride
Answer: D: Fluoride 
Explanation: The sample taken in image is Vitreous sample . A preservative Potassium/sodium fluoride 0.5-2%w/v is used for Collecting vitreous humour sample for ethanol analysis in postmoem toxicology cases.