Gwen remained silent and waited for the other students to answer. She only tried to figure out why they decided to make such an odd combination. History of Magic and Care of Magical Creatures? Psh. What do these have in commom?!, the Ravenclaw asked herself.

However, when the second question came up, the third year decided to think of an answer this time. 'Some ingredients that are needed in potions can only be found in the Lake' There- is it enough?

Maybe it is also useful because the Hogwarts plumbing network drains into it?, she thought, but decided not to say that out loud. Too stupid. Something else, then... Hmm... First years sail across the lake... or... 'Transportation? Students from Durmstrang arrived here with a boat' Ship. Somewhat.