For which one of the following snakes is the diet mainly composed of other snakes?

Correct answer: 4) King cobra. The king cobra (Ophiophagus hannah) is characteristically ophiophagous — it largely restricts its diet to other snakes, and some individuals even specialize on a single snake species [1]. School-level text also notes that cobras will eat other snakes (cannibalism), along with birds and small mammals, underscoring their snake-focused feeding habit [2]. In contrast, kraits, Russell’s viper and rattlesnakes generally take a broader range of vertebrate prey (rodents, amphibians, lizards, or small mammals) rather than predominantly other snakes. Field accounts and dietary studies therefore identify the king cobra as the species whose diet is mainly composed of other snakes.

Sources

1. [1] https://animaldiversity.org/accounts/Ophiophagus_hannah/
2. [2] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 12: Animal Diversity of India > BIVERSITY gF INilffi > p. 188