You are answering a USMLE-style medical question. Question: A clinical trial is conducted to test the efficacy of a new drug, A, to treat tinea versicolor. A total of 500 participants are recruited for the study and are randomized into 2 groups in equal numbers. Group 1, the study treatment group, is given drug A, while group 2, the control group, is given the current standard antifungal therapy. After the completion of therapy, 190 participants from the study treatment group and 165 participants from the control group are cured. Which calculation below represents the number needed to treat for the new drug? Options: A) 25/250 B) 250/25 C) 190/250 D) 355/500 Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.