Who is an animagus in harry potter?

Remus Lupin IS NOT an animagus he is a werewolf there is a VERY LARGE DIFFERENCE! Animagus is a witch or wizard who trained for years to be able to turn into any animal they trained for at will. A werewolf is a person bitten by another werewolf therefore turning into a werewolf. They transform once a month at the full moon and becomes a vicous werewolf not knowing of his/her surroundings and would kill his/her best friend if they crossed paths. A werewolf does not have a choice. C is an incorrect answer. The answer should only be A and D. Get your Harry Potter facts straight.