Match the scientists given in column I with their discovery given in column II and choose the correct option.

Column-I	Column-II
(Scientists)	(Discovery)
A. Ernst Mayr	I. Discovered Viroids
B. Whittaker	II. Gave the name virus
C. Pasteur	III. Proposed five kingdom classification
D. Diener	IV. Darwin of the 20th century

Correct Answer : A.

Ernst Mayr was a renowned taxonomist, tropical explorer, ornithologist, and historian of science. His work contributed to the conceptual revolution that led to the modern evolutionary synthesis of Mendelian genetics, systematics, and Darwinian evolution, and to the development of the biological species concept. Robert Harding Whittaker was a distinguished American plant ecologist. He was the first to propose the five-kingdom taxonomic classification of the world's biota into the Animalia, Plantae, Fungi, Protista, and Monera in 1959. Louis Pasteur was a French chemist and microbiologist renowned for his discoveries of the principles of vaccination, microbial fermentation and pasteurization. He gave the name virus. Theodor Otto Diener discovered the viroid, a plant pathogen one fiftieth of the size of the smallest viruses. These tiny single-stranded RNA molecules were responsible for causing a devastating disease of potato plants, called potato spindle tuber disease, as well as at least 15 other crop diseases. Diener named it the viroid because it is like a virus.