<prompt> Prophylactic thyroidectomy is done for:HashimotoMEN 2B syndromeReidelGraves  <response>: Ans. bMEN 2BRef: Schwartz 10th edition Page 1550 Patients with RET oncogene mutations, MEN- 2a Syndrome must be taken for Prophylactic thyroidectomy at 5 years MEN- 2b Syndrome must be taken for Surgery at 1 year 