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: Ophthalmology
Assessment of the visual acuity in children below 2 years of age can be made by the following tests, except: 
Select and explain. 
A. Landolt's chas, B. Pattern visual evoked potential, C. Preferential looking behaviour, D. Optokinetic nystagmus
A: Landolt's chas
Answer: A: Landolt's chas 
Explanation: Ans. Landolt's chas