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
History of excessive thirst, hunger, micturition during nights and recent loosening of teeth usually indicate that the patient is suffering from: 
Select and explain. 
A. Hypertension, B. Hyperthyroidism, C. Diabetes mellitus, D. Glomerulonephritis
C: Diabetes mellitus
Answer: C: Diabetes mellitus 
Explanation: None