Dr. M. S. Swaminathan has distinguished himself in which of the following fields?

Dr. M. S. Swaminathan is an Indian agricultural scientist who has distinguished himself in the field of agriculture. He is known as the “Father of the Green Revolution” in India for his work on developing high-yielding varieties of wheat. He has also served as the director general of the Indian Council of Agricultural Research and as the chairman of the National Commission on Farmers.

Option A is the correct answer.

Option B is incorrect because Dr. Swaminathan is not a medical doctor.

Option C is incorrect because Dr. Swaminathan is not an astrophysicist.

Option D is incorrect because Dr. Swaminathan is not a physicist.