Vera has 10 white socks, 10 black socks, 10 brown socks, 10 blue socks, and 10 red socks. How many socks (at a minimum) must she pull out of her sock drawer to ensure at least one matching pair?

I think it is a stupid question too.

I will assume that all the socks of each colour are identical.

At a minimum 2. she might get lucky

At a maximum 6. She might pull out one of each colour before finally pulling out a second of any.