A 20 year old male presents with chronic constipation, headache and palpitations. On examination he had marfanoid habitus, neuromas of tongue, medullated corneal nerve fibers and nodule of 2 x 2 cm size in It lobe of thyriod. This pt. is a case of -: (A) Sporadic medullary carcinoma of thyroid, (B) Familial medullary carcinoma of thyroid, (C) MEN IIA, (D) MEN IIB
Answer is D. None