Topic: interview question

First i wld simle at him to let him know that am not that strong to that question but relax, wld look at him directly on the face to make an eye contact and try and say wow to know i just thot abt it and then say I wld try am let the person see that an not here to market my product but to show that change is need, attitude is a plus by being dipomatic on his suggestion never bring out the environment on question but the usefulness of the product