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: Pathology
Gingiva are enlarged in leukemia because of 
Select and explain. 
A. Capillary dilation, B. Erythrocyte engorgement, C. Edema, D. WBC infiltration
D: WBC infiltration
Answer: D: WBC infiltration 
Explanation: None