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
True statement about Jackson's Cross - Cylinder test is 
Select and explain. 
A. Used for subjective refinement of spherical error, B. Most commonly uses -0.5D sphere with +0.5D cylinder, C. Uses spherocylindrical toric lens, D. All of the above
C: Uses spherocylindrical toric lens
Answer: C: Uses spherocylindrical toric lens 
Explanation: It is used for subjective refinement of cylindrical error. Most commonly uses -0.5D sphere with +1.0D cylinder.