Four words have been given, out of which three are alike in some manner and one is different. Select the word that is different.

Goitre Diarrhoea Scurvy Anaemia

Diarrhoea

Goitre -  Not a type of infection diseases Diarrhoea  -  IT is a type of infection diseases Scurvy -  Not a type of infection diseases Anaemia -  Not a type of infection diseases