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: Forensic Medicine
Florence test done on dry seminal stain shows dark-brown crystals due to: September 2012, March 2013 (e) 
Select and explain. 
A. Sperm, B. Dye, C. Spermine, D. Choline
D: Choline
Answer: D: Choline 
Explanation: Ans. D i.e. Choline Florence test of semen depends on choline