question: Q:A 23-year-old man comes to the emergency department because of a rash on his neck and back for the past 6 hours. He says that he first noticed some reddening of the skin on his back the previous evening, which turned into a blistering, red rash overnight. He went surfing the previous day and spent 5 hours at the beach. He reports having applied at least 1 oz of water-resistant SPF 30 sunscreen 30 minutes before leaving his home. His vitals are within normal limits. Physical examination shows erythema of the skin over the upper back and dorsum of the neck, with 3 vesicles filled with clear fluid. The affected area is edematous and tender to touch. Which of the following recommendations is most appropriate to prevent a recurrence of this patient's symptoms in the future?? 
  {'A': 'Reapply sunscreen after water exposure', 'B': 'Apply sunscreen directly before getting into water', 'C': 'Use SPF 50 sunscreen', 'D': 'Apply at least 3 oz of sunscreen', 'E': 'Use waterproof sunscreen'},