This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other hea diseases in children, Subject name: Pediatrics
What is the minimal internal diameter of giant coronary aneurysm in children with Kawasaki disease which pose highest risk for ruptures, thrombosis, stenosis and myocardial infarction? 
Select and explain. 
A. 8 mm, B. 10 mm, C. 12 mm, D. 15 mm
A: 8 mm
Answer: A: 8 mm 
Explanation: --> Giant coronary aery aneurysms (classic definition of > 8 mm internal diameter) pose the greatest risk for rupture, thrombosis or stenosis, and myocardial infarction