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: Medicine
Not seen in hyperparathyroidism 
Select and explain. 
A. Increase in serum calcium, B. Increase in serum calcitonin, C. Subperiosteol resorption of phalanges, D. Increase in 24 hr urinary calcium excretion > 250
B: Increase in serum calcitonin
Answer: B: Increase in serum calcitonin 
Explanation: None