This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Forensic Medicine
Not a feature of brain death 
Select and explain. 
A. Complete apnea, B. Absent Pupillary reflex, C. Absence deep tendon reflex, D. Hea rate un-responsive to atropine
D: Hea rate un-responsive to atropine
Answer: D: Hea rate un-responsive to atropine 
Explanation: The structural and functional damage of brain-stem may be diagnosed depending upon the following observations: Dilated fixed pupils, not responding to sharp changes in intensity of incident light. Absence of motor responses within the cranial nerve distribution on painful stimulation. Absence of corneal reflexes. Absence of vestibulo-ocular reflexes. Absence of gag reflex or reflex response to bronchial stimulation by a suction-catheter passed down the trachea. Absence of spontaneous breathing. Ref : Krishnan vij Textbook of Forensic medicine and Toxicology 5th edtion ; pg no - 75