Ans. is 'd' i.e. Hb- electrophoresisElectrophoretic techniques are used for routine hemoglobin analysis. It helps in quantification and identification of various hemoglobins.As we all are aware that thalassemia is a quantitative defect in Hb characterized by lack of certain types of hemoglobin and compensatory increase in other hemoglobin, therefore electrophoresis proves to be a reliable method for screening in thalassemia.