This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid Gland, Subject name: Surgery
Highly aggressive and lethal thyroid cancer: 
Select and explain. 
A. Papillary, B. Follicular, C. Medullary, D. Anaplastic
D: Anaplastic
Answer: D: Anaplastic 
Explanation: Ans. (d) Anaplastic CancerRef: Bailey and Love 27th Edition, Page 820* Lethal almost always in 6 months.* It can arise de novo or dedifferentiation of a papillary or poorly differentiated carcinoma** RT and CT does not increase survival