<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 28-year-old woman with HIV comes to the physician because of an 8-day history of severe pain while swallowing. She has been hospitalized several times with opportunistic infections and has poor adherence to her antiretroviral drug regimen. Endoscopy shows extensive, white, plaque-like lesions in the proximal esophagus. Culture of a biopsy specimen grows Candida albicans. Treatment with intravenous anidulafungin is initiated. Which of the following is the primary mechanism of action of this drug?? A: Decreased DNA synthesis, B: Binding to ergosterol, C: Binding to tubulin, D: Decreased glucan synthesis, E: Inhibition of squalene epoxidase,  <response>: This is a medical question asking about the mechanism of action of anidulafungin, an antifungal drug, in the context of a patient with HIV and esophageal candidiasis. The key information in the question stem is that the patient has esophageal candidiasis caused by Candida albicans, and is being treated with intravenous anidulafungin. To answer this question, we need to know the mechanism of action of anidulafungin. The choices provide different possible mechanisms of action for antifungal drugs. Based on my medical knowledge, anidulafungin belongs to the echinocandin class of antifungal drugs, which work by inhibiting glucan synthesis in the fungal cell wall. Therefore, the correct answer should be the one mentioning glucan synthesis.D: Decreased glucan synthesis 