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
[{'content': 'If the length of eyeball increases by 1 mm. The net effect will be: September 2007 \nSelect and explain. \nA. Myopia of 6D, B. Hypermetropia of 6D, C. Myopia of 3D, D. Hypermetropia of 3D', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C: Myopia of 3D', 'role': 'assistant'}]