<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 16-year-old boy is brought to the physician by his mother because of a 4-day history of painful lesions in his mouth. During the past year, he has twice had similar lesions that resolved without treatment after approximately 10 days. He has never had any genital or anal lesions. His mother reports that he has been very stressed over the past month because he is approaching his senior year at high school. He is otherwise healthy and takes no medications. He appears thin. His temperature is 37.6C 99.7F. A photograph of his oral cavity is shown. The remainder of the examination shows no abnormalities. Which of the following is the most likely diagnosis?? A: Pemphigus vulgaris, B: Oral thrush, C: Herpangina, D: Aphthous stomatitis, E: Oral leukoplakia,  <response>: Based on the information provided in the question stem, this is likely a case of recurrent aphthous stomatitis canker sores. The key findings are:- 16-year-old boy with painful oral lesions that have occurred 3 times over the past year and resolved spontaneously after about 10 days each time. This recurrence pattern is typical of canker sores.- No history of genital or anal lesions makes herpes simplex virus less likely.- Recent stress mentioned as he is approaching senior year of high school. Stress can trigger canker sores. - Otherwise healthy with no medications. This makes other systemic conditions like autoimmune disorders less likely.- Oral photo shows typical shallow ulcers of canker sores.- Pemphigus vulgaris causes blisterserosions, not ulcers. Oral thrush is a yeast infection. Herpangina is a viral infection caused by coxsackievirus. Oral leukoplakia refers to white patchesplaques.D: Aphthous stomatitis 