A 35-year-old female, a known case of diabetes presented with painless swelling in the neck which moved with deglutition and was irregular and firm in consistency along with constipation, weight gain, hoarseness of voice, oligomenorrhea and mild paresthesias. O/E: - Bradycardia Cold extremitie Non-pitting edema Delayed relaxation of DTR's TFTs revealed high TSH and low unbound T4 levels. RAIU was mildly increased. TPO antibodies were also raised. FNAB of the thyroid The above condition predisposes the patient to which cancer: -