Multitasking is tricky! Sometimes it's impossible to juggle five different things at once. Show enthusiasm and confidence when you give your example. You can handle it! Give the interviewer confidence that you can do it!
"On busy days I help out at the front desk. I often have to bounce back and forth between answering phones, scheduling appointments and assisting patients in the office. I've gotten used to it and I enjoy the variety and the challenge."