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': 'Rosette shaped cataract is seen in - \nSelect and explain. \nA. Trauma, B. Radiation, C. DM, D. Iridocyclitis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Concussion cataract occurs mainly due to inhibition of aqueous and partly due to direct mechanical effects of the injury on lens fibres. Following types of cataract occurs :- i) Discrete subepithelial opacities; ii) Early rosette cataract (punctate); iii) Late rosette cataract; iv) Zonular cataract; v) Diffusion cataract; vi) Early maturation of senile cataract.', 'role': 'assistant'}]