<prompt> Treatment of choice in Medullary Ca thyroidTotal thyroidectomyTotal thyroidectomy Radical neck dissectionTotal thyroidectomy RadiotherapyTotal thyroidectomy Prophylactic CCND  <response>: Surgery is the main therapeutic modality. Total thyroidectomy with bilateral central node dissection and ipsilateral lateral neck dissection if primary tumor is greater than 1cm or central nodes are positive. Reference: SRBs Manual of Surgery, 6th Edition, page no 477. Reference: Bailey love, 26th Edition, page no 769. 