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: Pharmacology
A man of 50 years presents following the death of his wife, which one is an abnormal grief reaction NOT RELATED-PSYCHIATRY 
Select and explain. 
A. A brief episode of seeing the dead person, B. Poor concentration, C. Poor memory, D. Delayed or absent grief
D: Delayed or absent grief
Answer: D: Delayed or absent grief 
Explanation: .