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
Which of the following type of malignancy is associated with the characteristic Zellballen pattern on histopathology? 
Select and explain. 
A. GIST, B. Astrocytoma, C. Carotid body tumor, D. Retinoblastoma
C: Carotid body tumor
Answer: C: Carotid body tumor 
Explanation: Zellballen pattern refers to the nest-like clusters of uniform, round-to-polygonal chief cells surrounded by delicate richly vascular tissue and sustentacular cells. This histological pattern is a characteristic feature of carotid body paraganglioma.