Choose or find odd word - Titan , Mercury , Earth , Jupiter

A. TITAN

Choose or find odd word - Hypothesis , Assumption , Observation , Experiment

D. EXPERIMENT

Choose or find odd word - Ramayana , Mahabharata , Upnishad , Panchatantra

D. PANCHATANTRA

Choose or find odd word - Pupil , Iris , Cornea , Medulla , Retina

D. MEDULLA

Choose or find odd word - Teacher , Principal , Student , Lecturer

C. STUDENT