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: Pharmacology
Which of the following is NOT an important/ frequent/well-known manifestation of an adverse drug reaction? 
Select and explain. 
A. Agranulocytosis, B. Aplastic anaemia, C. Haemolysis, D. Leukaemia
D: Leukaemia
Answer: D: Leukaemia 
Explanation: None