Of course, this seems to be an intelligent question and is now being introduced in most of the interviews specifically designed for the selection of the executives. Such question offers the aspirant an opportunity to reveal one's temperament. However, while narrating the merits or demerits, caution has to be exercised so that one should restrict to minimum words while projecting the merits. The Board is always watchful how the aspirant represents himself.
Selection of right words, maintaining polity and avoiding the contradictory expression would lead to success and again in respect of demerits, avoid telling that you are forgetful, impulsive in your dealing and sometimes excited depending upon the situation.
You can add that you cannot leave without helping a senior citizen in distress, offering tofees to children all the time when they do a commendable job.
In nut - shell, your presentation should be a balanced one devoid of exaggeration and should reflect your mental alertness.