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
A 24 years old farm worker is rushed to, a nearby emergency department after an accidental exposure to parathion. Which of the following drugs can be given to increase the activity of his acetyl cholinesterase: 
Select and explain. 
A. Atropine, B. Dimercaprol, C. Physostigmine, D. Pralidoxime
D: Pralidoxime
Answer: D: Pralidoxime 
Explanation: None