Select the most appropriate one word for the expression given below.

The branch of philosophy concerned with the theory of knowledge

Correct option is A

• Given expression: “The branch of philosophy concerned with the theory of knowledge” refers to the study of knowledge, including its nature, sources, limits, and validity—i.e., how we know what we know.

• Correct one-word substitution – Epistemology:

• Epistemology is the branch of philosophy that studies knowledge and belief, especially the nature and basis of knowledge.

• (Hindi meaning: ज्ञानमीमांसा / ज्ञान का सिद्धांत)

• Example: Epistemology examines whether knowledge comes from reason, experience, or both.

• Meanings of other options (why they are incorrect):

• (b) Atmology – study of vapour/steam (rare term) (Hindi: वाष्प-विज्ञान / भाप का अध्ययन)

• (c) Seismology – study of earthquakes (Hindi: भूकंप विज्ञान)

• (d) Polemology – study of war and conflict (Hindi: युद्ध-विज्ञान / युद्ध का अध्ययन)

So the correct answer is (a).