Make sure you are familiar with their programs and the opportunities they provide before providing your answer.
As they state on their site, "What's your field of interest? Explore the fields of study within pharmacy and find the right program for you." Their programs and areas of study include Pharmaceutical Business, Pharmaceutical Sciences, Pharmacology and Toxicology, Doctor of Pharmacy (PharmD), Regulatory Affairs, and Pharmaceutical Economics and Health Policy.
Additionally, when offering your least favorite area, maintain a positive attitude towards that aspect of pharmacy. You want to come across as ready, capable, and willing to perform every aspect of your future job, even the parts you like least. Additionally, explain why. For most people, their reasons align with their dominant behavioral traits, that of being an introvert and enjoying more analytical tasks or being an extrovert and enjoying more human interaction. Even when you have a preference, try to strike a balance between both spheres.