Focus on a weakness related to your profession, but not one that is an essential job duty. For example, suppose you say your weakness is your listening skills. In that case, the interviewer may pass you over for another candidate since that skill is an essential part of being an excellent Merck Intern.

"My greatest weakness as a student has been remembering people's names when I first meet them. I understand it is a weakness in this profession because I need to remember my mentor and coworkers' names. I recently bought a book called 'How to Remember Names and Faces' by Luis Echeverria. He is a Memory Master Champion and guarantees success by reading his book and practicing his memory training exercises. I have been reading the book for a week and already found I remember people's names and faces better. I am confident this weakness will become a strength when I am finished with the book and the exercises."