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
The only reliable method to distinguish between a follicular adenoma and a follicular carcinoma: 
Select and explain. 
A. Histological evidence of Angioinvasion., B. Radiography, C. Peripheral smear, D. All of the above
A: Histological evidence of Angioinvasion.
Answer: A: Histological evidence of Angioinvasion. 
Explanation: None