The famous dialogue between, Nachiketa and Yama is mentioned in the

The famous dialogue between the boy Nachiketa and Yama (the lord of death) is narrated in the Katha (Kathopanishad). The provided book excerpt recounts Nachiketa’s persistence in questioning Yama about what happens after death and describes Yama’s teaching on the ātman — that it is neither born nor dies and is immortal — which is the core of the Nachiketa–Yama narrative [1]. A contemporary web excerpt explicitly titles this story as “A dialogue from the Katha Upanishad between Nachiketa and Yama,” confirming the identification of the source text as the Katha/Kathopanishad. Hence the correct option is Kathopanishad (Katha Upanishad).

Sources

1. [1] Exploring Society:India and Beyond. Social Science-Class VI . NCERT(Revised ed 2025) > Chapter 7: India's Cultural Roots > Nachiketa and his quest (Katha Upaniṣhad) > p. 112