This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology and breast, Subject name: Anatomy
Parathyroid adenoma most commonly involves which of the following site 
Select and explain. 
A. Thyroid substance, B. Superior parathyroid lobe, C. Inferior parathyroid lobe, D. In the mediastinum
C: Inferior parathyroid lobe
Answer: C: Inferior parathyroid lobe 
Explanation: Adenomas are most often located in the inferior parathyroid glands, but in 6-10% of patients, parathyroid adenomas may be located in the thymus, the thyroid, the pericardium, or behind the esophagus.