This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
Most well differentiated thyroid tumor is 
Select and explain. 
A. Papillary carcinoma, B. Medullary carcinoma, C. Follicular carcinoma, D. Anaplastic carcinoma
A: Papillary carcinoma
Answer: A: Papillary carcinoma 
Explanation: (A) Papillary carcinoma # Follicular cell origin: (A) Differentiated. (B) Undifferentiated.# DIFFERENTIATED:* Papillary carcinoma (60%);* Follicular carcinoma (15%);* Mixed papillary and follicular carcinoma.# UNDIFFERENTIATED:* Anaplastic carcinoma (13%).> Clinical features: It is the most slow growing among the malignant tumours of the thyroid.