Three groups of diseases are given as:
Group 1 : Goitre, scurvy, beri-beri
Group 2 : Dengue, malaria, night blindness
Group 3 : Cholera, typhoid, common cold
The odd one out in group 1, 2 and 3 are respectively
ABeri-beri, dengue and cholera
BScurvy, night blindness and common cold
CBeri-beri, malaria and typhoid
DGoitre, night blindness and common cold.