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: Pharmacology
Propranolol is contraindicated in diabetes mellitus because it: 
Select and explain. 
A. Causes hyperglycemia, B. Causes seizures, C. Masks the hypoglycemic symptoms, D. Causes hypotension
C: Masks the hypoglycemic symptoms
Answer: C: Masks the hypoglycemic symptoms 
Explanation: None