This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
Thyroid carcinoma associated with hypocalcaemia is- 
Select and explain. 
A. Follicular carcinoma, B. Medullary carcinoma, C. Anaplastic carcinoma, D. Papillary carcinoma
B: Medullary carcinoma
Answer: B: Medullary carcinoma 
Explanation: 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 Davidson's Principles and practice of Medicine 22nd edition