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
Not a feature of brain death - 
Select and explain. 
A. Complete apnea, B. Absent pupillary reflex, C. Absent deep tendon reflex, D. Heart rate unresponsive to atropine
C: Absent deep tendon reflex
Answer: C: Absent deep tendon reflex 
Explanation: The absence of deep tendon reflexes is not required to diagnose brain death because the spinal cord may remain functional.