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
Drug of choice for anti-psychotic induced Parkinsonism 
Select and explain. 
A. Pimavanserin, B. Trihexyphenidyl, C. Droxidopa, D. Pramipexole
B: Trihexyphenidyl
Answer: B: Trihexyphenidyl 
Explanation: Central anticholinergics  are used for treatment of drug induced parkinsonism