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
Which one of the following is not a part of triad of Balint's syndrome 
Select and explain. 
A. Oculomotor apraxia, B. Optic ataxia, C. Simultanagnosia, D. Acalculia
D: Acalculia
Answer: D: Acalculia 
Explanation: Acalculia is a feature in Gertsmann's syndrome.