This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid Malignancies, Subject name: Surgery
[{'content': 'Least malignant thyroid cancer is: \nSelect and explain. \nA. Papillary carcinoma, B. Follicular carcinoma, C. Medullary carcinoma, D. Anaplastic carcinoma', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans is 'a' i.e. Papillary Cancer Important points about thyroid malignancy :Least MalignantPapillary CaMost MalignantAnaplastic CaMC type of thyroid cancer after radiationPapillary Ca*Latent period for radiation induced thyroid CaAbout 30 yrs*Type of thyroid cancer assoc with MEN syndromeMedullary Ca*Thyroid Ca assoc with amyloidosisMedullary Ca*Thyroid Ca assoc with dystrophic calcificationPapillary*Psammoma bodies are seen inPapillary Ca*Orphan Annie-eyed nuclei are seen inPapillary Ca*Thyroid cancer occurring in longstanding multinodular goitreFollicular Ca*Carcinoma derived from the C cells of thyroidMedullary*", 'role': 'assistant'}]