The correct option is B A-ii, B-i, C-iv, D-iii
The scientists listed in various options made important breakthrough discoveries. Insulin is a peptide hormone which lowers blood glucose levels. Banting and Best first isolated insulin. Hybridoma technology is a technology of forming hybrid cell lines (called as hybridomas) by fusing an antibody-producing B cell with a myeloma (B cell cancer) cell. The production of monoclonal antibodies was invented by Cesar Milstein and Georges J. F. Khler in 1975. Plant tissue culture is a technique of growing plants from a small vegetative part. A. Caplan and F. C. Stewart used coconut milk plus 2, 4-D for proliferation of cultured carrot and potato tissues through tissue culture techniques. In 1977, Steptoe and Edwards successfully carried out a pioneering in vitro conception which resulted in the birth of the world's first baby to be conceived by IVF, Louise Brown on 25 July 1978, in Oldham General Hospital, Greater Manchester, UK.