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: Ophthalmology
[{'content': 'Which is example of the Simple Myopic Astigmatism among the prescriptions given below: \nSelect and explain. \nA. Rx (+) sphere, B. Rx will be plano (-), C. Rx will be (-) sphere, D. (-)(+) (+)(-) on both 90 and 180 degree axis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: * When eyewear prescriptions are written, they can be classified into different areas depending on the power or refractive error. * There are seven categories to which prescriptions can fall: 1. Simple Hyperopia, the Rx will be (+) sphere 2. Simple Myopia, the Rx will be (-) sphere 3. Simple Myopic Astigmatism, the Rx will be plano (-) 4. Simple Hyperopic Astigmatism, the Rx will be (+) 5. Compound Hyperopic Astigmatism, major meridian power will be (+) (+) on both 90 and 180 degree axis 6. Compound Myopic Astigmatism, major meridian power will be (-) (-) on both 90 and 180 degree axis 7. Mixed Astigmatism, major meridian powers will be opposites (-)(+) (+)(-) on both 90 and 180 degree axis REF : AK KHURANA 7TH ED', 'role': 'assistant'}]