<prompt> A 2 years old child without fever develops bone pain, vomiting, and features of increased intracranial pressure following excessive meditation. The drug most likely to be responsible for this is;Vitamin DVitamin APhenothiazinePhenytoin  <response>: Vitamin A is stored in the liver, deficiency symptoms appear only after long-term deprivation, but vit A deficiency is quite prevalent, especially among infants and children in developing countries. Manifestations are Xerosis dryness of the eye, Bitots spots, keratomalacia softening of the cornea, corneal opacities, night blindness nyctalopia progressing to total blindness. Dry and rough skin with papules Phrynoderma, hyperkeratinization, atrophy of sweat glands. Keratinization of bronchopulmonary epithelium increased susceptibility to infection. Unhealthy gastrointestinal mucosa, diarrhoea. Increased tendency to urinary stone formation due to the shedding of ureteric epithelial lining which acts as a nidus. Sterility due to faulty spermatogenesis, etc 