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
All the following statements about Thyroid carcinoma are true, except: 
Select and explain. 
A. Thyroid lymphoma is often associated with hashimoto's thyroiditis, B. Papillary ca is multifocal, C. Medullary ca is associated with MEN2a, D. Follicular carcinoma spreads mainly by lymphatic
D: Follicular carcinoma spreads mainly by lymphatic
Answer: D: Follicular carcinoma spreads mainly by lymphatic 
Explanation: Major spread of follicular carcinoma is through blood, papillary carcinoma through lymphatics. Ref: Harrison's, 18th Edition, Page 2436