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
Variant of papillary carcinoma thyroida) Medullaryb) Warthinc) Columnar celld) Insulare) Diffuse sclerosing 
Select and explain. 
A. cde, B. bae, C. acd, D. cab
A: cde
Answer: A: cde 
Explanation: None