The correct answer is option 4, Venkataraman Ramakrishnan. He is a scientist of Indian origin who has been the President of the Royal Society.

Option 1, Ronald Ross, is not the correct answer. Ronald Ross was a British doctor who won the Nobel Prize in Physiology or Medicine in 1902 for his discovery about the transmission of malaria parasites. However, he was not the President of the Royal Society.

Option 2, Har Gobind Khorana, is also not the correct answer. Har Gobind Khorana was an Indian-American biochemist who won the Nobel Prize in Physiology or Medicine in 1968 for his interpretation of the genetic code and its function in protein synthesis. He did not serve as the President of the Royal Society.

Option 3, Chandrasekhara Venkata Ramana, is also not the correct answer. Chandrasekhara Venkata Ramana, commonly known as C. V. Raman, was an Indian physicist who won the Nobel Prize in Physics in 1930 for his work on the scattering of light and the discovery of the Raman effect. He did not hold the position of the President of the Royal Society.

Therefore, the only correct option is option