This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cataract, Subject name: Ophthalmology
Which of the following is not a cause of cataract 
Select and explain. 
A. Diabetes, B. Wilson disease, C. Galactosemia, D. Hypomagnesemia
D: Hypomagnesemia
Answer: D: Hypomagnesemia 
Explanation: Hypomagnesemia is least likely to cause cataract MISCELLANEOUS CATARACTS Diabetes- Snowflake/ snowstorm cataract Wilson's- Sunflower cataract, chalcosis. Bread crump appearance- Complicated cataract Coicosteroid cause posterior subcapsular cataract.(Note topical steroids cause glaucoma more; systemic cause cataract more). Oil drop cataract -galactosemia is reversible (deficiency of GPUT) Anterior lenticonus- Alpo Posterior Lenticonus- Lowe Syndrome Shield cataract- Atopic dermatitis. Radiation can cause PSC cataract. Hypocalcemic cataract - Tetanic cataract Myotonic dystrophy- Christmas tree cataract Persistent hyaloid aery&mittendorf dot -can be a cause of Posterior polar cataract.