Kw / OH Concentration

5 mL of 0.002 M HCl is dissolved into 1 Liter of water. What is the OH- concentration?

a. 1 x 10^-6 M
b. 1 x 10^-7 M
c. 1 x 10^-8 M
d. 1 x 10^-9 M
e. 1 x 10^-10 M