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
Patients may experience fatigue, mental status changes, dehydration, or symptoms of nephrolithiasis in humoral hypercalcemia of malignancy , is when the serum calcium level is more than: 
Select and explain. 
A. 14 mg/dl, B. 12 mg/dl, C. 11 mg/dl, D. 10 mg/dl
A: 14 mg/dl
Answer: A: 14 mg/dl 
Explanation: Humoral hypercalcemia of malignancy (HHM) Humoral hypercalcemia of malignancy (HHM) occurs in 20% of cancer. It is commonly seen in cancers of the lung, head and neck, esophagus, breast, genitourinary tract and in multiple myeloma & lymphomas. Caused most commonly by overproduction of PTHrP When the calcium levels are markedly increased >14 mg/dL patients may experience fatigue, mental status changes, dehydration, symptoms of nephrolithiasis. Ref: Harrison,E-18,P-828