<prompt> A autosomal recessive disorder caused by mutation in SLC19A2 gene and characterized by megaloblastic anemia, diabetes mellitus and sensorineural hearing loss. This child responds to which nutrientVitamin B12Vitamin cVitamin B1Folic acid  <response>: This is Thiamine Responsive Megaloblastic syndrome:It occurs due to mutation of SLC19A2 gene, encoding thiamine transporter protein, Leading to abnormal thiamine transportation.Clinical features:Megaloblastic anemiaDiabetes mellitusSensorineural hearing loss. 