This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrine, Subject name: Pathology
Which is the least common thyroid malignancy? 
Select and explain. 
A. Papillary carcinoma, B. Follicular carcinoma, C. Medullary carcinoma, D. Anaplastic carcinoma
D: Anaplastic carcinoma
Answer: D: Anaplastic carcinoma 
Explanation: Ans. is 'd' i.e., Anaplastic carcinoma * Least common type of thyroid carcinoma is anaplastic type.* Most common type of thyroid carcinoma is papillary carcinoma (75%-85%) followed by follicular carcinoma (10-15%), medullary carcinoma (5%) and anaplastic carcinoma (<5%).