This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thanatology, Subject name: Forensic Medicine
Colour change in pyrogallol test for air embolism is 
Select and explain. 
A. Orange to brown, B. Green to yellow, C. Colourless to brown, D. Colourless to pink
C: Colourless to brown
Answer: C: Colourless to brown 
Explanation: Pyrogallol test : - To detect antemoem air embolism - Gas from the hea on addition to pyrogallol solution will change from colourless to brown in presence of free oxygen