<prompt> Vitamin A deficiency causes all of the following EXCEPT:-Growth retardation due to impairment in skeletal formationDegeneration of germinal epithelium leading to sterility in malesNyctalopiaLoss of weight, irritability, loss of hair and joint pains  <response>: Night blindness nyctalopia is one of the earliest symptoms of vitamin A deficiency.Vitamin A deficiency results in growth retardation due to impairment in skeletal formation.The reproductive system is adversely affected in vitamin A deficiency. Degeneration of germinal epithelium leads to sterility in males. Excessive consumption of vitamin A leads to toxicity. The symptoms of hypervitaminosis A include dermatitis drying and redness of skin, enlargement of liver, skeletal decalcification, tenderness of long bones, loss of weight, irritability, loss of hair, joint pains etc.Key Concept:Vitamin A deficiency causes growth retardation due to impairment in skeletal formation,degeneration of germinal epithelium leading to sterility in male and nyctalopiaReference: Satyanarayana- Biochemistry, 3rd edition, pg-123 