This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Which of the following is not included in Sipple's syndrome- 
Select and explain. 
A. Pheochromocytoma, B. Medullary carcinoma thyroid, C. Hyperthyroidism, D. Hyperparathyroidism
C: Hyperthyroidism
Answer: C: Hyperthyroidism 
Explanation: MEN type IIA syndrome is known as Sipple's syndrome. It includes →​ Medullary Ca thyroid, Pheochromocytoma, Parathyroid adenoma