<prompt> Screening method of medullary carcinoma thyroid is:Serum calcitoninSerum calciumSerum alkaline phosphataseSerum acid phosphatase  <response>: Medullary Carcinoma Thyroid MTC:Neuroendocrine carcinoma arising from parafollicular C cells of thyroid.Parafollicular C cells are derived from the ultimobranchial bodies and secrete calcitonin.C Cells are concentrated superolaterally in thyroid lobes, from where MTC usually develops.Most MTCs 75-80 arise sporadically.Spread is both lymphatic and hematogenous.MC site of metastasis: Liver 