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: Surgery
Leukocytic infiltraton in islet cells of pancrease is characterstically seen in some cases of - 
Select and explain. 
A. Juvenile diabetes, B. Diabetic ketosis, C. Systemic mucoviscidosis, D. Haemorrhagic pancreatic necrosis
A: Juvenile diabetes
Answer: A: Juvenile diabetes 
Explanation: Type 1 diabetes is a T cell-mediated autoimmune disease, characterized by lymphocytic infiltration of the pancreatic islets.