<prompt> Thyroid carcinoma associated with hypocalcaemia is-Follicular carcinomaMedullary carcinomaAnaplastic carcinomaPapillary carcinoma  <response>: Medullary carcinoma of thyroid arises from the parafollicular C cells of the thyroid. It secretes calcitonin, 5-HT, tachykinins, ACTH and prostaglandins. Hypercalcitoninemia lowers the serum calcium levels leading to hypocalcemia rare. Reference : page 755 Davidsons Principles and practice of Medicine 22nd edition 