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: Surgery
Reduction in flow of saliva is not generally seen in 
Select and explain. 
A. Elderly diabetics, B. Patient undergoing radiation therapy, C. Patients suffering from parkinsonism, D. Patients on phenothiazine drugs
C: Patients suffering from parkinsonism
Answer: C: Patients suffering from parkinsonism 
Explanation: None