This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Drowning, Subject name: Forensic Medicine
In deaths due to scuba diving, All of the following investigations done before, during and after autopsy is of more value except 
Select and explain. 
A. Diatom test, B. X - ray chest, C. X - ray knee joint, D. Gas chromatography
A: Diatom test
Answer: A: Diatom test 
Explanation: Investigations in SCUBA diving fatalities : Radiological examination: X-ray of chest in standing position will indicate a fluid level in chest cavity or presence of pneumothorax or pneumomediastinum. Radiographs of knees will show nitrogen bubbles in the joint, indicating a long diving period. In case of air embolism, air samples should be removed with a syringe lubricated by oil for gaschromatography and electron mass spectrometer analysis of gas components. >95% nitrogen indicates nitrogen narcosis. Diatoms test is a test used for detecting antemoem drowning, Not scuba diving.