"हाथी दूध पीता है।"
अनुवाद:The elephant drinks milk.
This answer is wrong for two reasons. Firstly we must have an article before elephant - it must be either "the elephant" or "an elephant". Just "elephant" not correct. Secondly because we are talking about just one single Elephant we must use drinks and not drink. You can see a bit more detail on why we add -s to verbs here.
An elephant drinks milk because we use always an article before elephant not the article