Choose or find odd word - Mahanadi , Cauvery , Narmada , Krishna

C. NARMADA

Choose or find odd word - Doe , Bitch , Sorceress , Drone , Mare

D. DRONE

Choose or find odd word - Granite , Lignite , Peat , Anthracite , Bituminous

A. GRANITE

Choose or find odd pair of words - (Sheep : Beat) , (Horse : Neigh) , (Ass : grunt) , (Owl : Hoot)

C. ASS : GRUNT

Choose or find odd word - Sepals , Bud , Filament , Stamens , Pistil

B. BUD