This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and breast, Subject name: Surgery
A 21 years old woman has 3 cm node in the lower deep cervical chain on the left. The biopsy is interpreted as revealing normal thyroid tissue in a lymph node. The most likely diagnosis is 
Select and explain. 
A. Subacute thyroiditis, B. Papillary carcinoma thyroid, C. Hashimoto's disease, D. Lateral aberrant thyroid
B: Papillary carcinoma thyroid
Answer: B: Papillary carcinoma thyroid 
Explanation: . Thyroid tissue present in cervical lymph nodes in the face of a clinically normal thyroid gland is a metastasis from an occult primary thyroid carcinoma Occasionally, a metastatic papillary thyroid cancer manifests as a painless lateral neck mass that is clinically detected before detecting the primary thyroid lesion. Sabiston 20th edition pg 926