The Indo-American scientist Har Gobind Khorana won the Nobel prize for his contribution in ____________.

Correct option is C

• Har Gobind Khorana, an Indo-American scientist, was awarded the Nobel Prize in Physiology or Medicine in 1968 for his groundbreaking work on genetics.
• Specifically, he was honored for his synthesis of RNA and its role in protein synthesis, which was a major contribution to the field of molecular genetics.
• His work helped in understanding the genetic code and how it directs protein synthesis, which is fundamental to the study of genetics and biochemistry.

• Born:9 January 1922, Raipur, Punjab (now in Pakistan) Died:9 November 2011, USA
  
• Key Contribution: First to synthesize artificial genes in a laboratory
• Workplaces: MIT (USA), University of Wisconsin
• Awards: Padma Vibhushan (1969), National Medal of Science (1987, USA.
  

Additional Information :

• Chemistry: While his work did have a chemical aspect, as it involved the synthesis of nucleotides and their arrangement in RNA, he was awarded the Nobel Prize in Physiology or Medicine.

• Mathematics: Har Gobind Khorana did not work in the field of mathematics.

•  Physics: Although his research involved understanding biological processes. His work was directly related to genetics and molecular biology.