This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
[{'content': '"Jack in the box" phenomenon is because of \nSelect and explain. \nA. Loss of accommodation, B. Reduced visual acuity, C. Prismatic effect, D. Spherical aberration', 'role': 'user'}, {'content': 'Answer: C \nExplanation: .', 'role': 'assistant'}]