This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Asphyxia, Subject name: Forensic Medicine
Pressure upon the chest leading to a so of mechanical fixation of chest and thereby preventing respiratory movements seen in 
Select and explain. 
A. Gagging, B. Choking, C. Smothering, D. Traumatic asphyxia
D: Traumatic asphyxia
Answer: D: Traumatic asphyxia 
Explanation: Traumatic asphyxia the term 'traumatic asphyxia' or 'crush asphyxia' is applied where there is pressure upon chest leading to a so of mechanical fixation of chest and thereby preventing respiratory movements. Eg: burial under the rubble of a collapsed building. Crushing under an automobile. Etc Ref: TEXTBOOK OF FORENSIC MEDICINE AND TOXICOLOGY KRISHNAN VIJ PAGE 118