A transgenic food crop which may help in solving the problem of night blindness in developing countries is

Correct Option (b) Reason : Vitamin-A deficiency causes night blindness among children. Vitamin-A deficiency often occurs where rice is the staple food since, rice grain does not contain β-carotene. Three transgenes providing phytoene synthase, phytoene desaturase, beta carotene desaturase and lycopene cyclase activities were transferred into rice by Agrobacterium mediated transformation. The resulting transgenic rice popularly called goldern rice contains good quantities of β-carotene.

Flavr savr is genetically modified tomato, which remains fresh and retain their flavour much longer than normal tomato due to the blocking of synthesis of fruit softening enzyme polygalacturonase.