In case of a long standing goitre., ca most probable to occur is :
Ans. is 'a' ie follicular "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
Follicular
Papillary
Anaplastic
Medullary
Thyroid Malignancies