Persistent multinodular goiter may cause -
Follicular Carcinoma
Pappilary Carcinoma
Medullary Carcinoma
Colloid Carcinoma
Ans. is 'a' i.e., Follicular Carcinoma "An increased incidence of cancer (usually follicular) has been reported from endemic areas. Dominant or rapidly growing nodules in longstanding goiters should always be subjected to aspiration cytology." - Bailey & Love
Thyroid Malignancies