You are answering a USMLE-style medical question. Question: A 13-year-old boy is brought to the emergency department by his mother because of a 6-hour history of severe eye pain and blurry vision. He wears soft contact lenses and has not removed them for 2 days. Ophthalmologic examination shows a deep corneal ulcer, severe conjunctival injection, and purulent discharge on the right. Treatment with topical ciprofloxacin is initiated. A culture of the ocular discharge is most likely to show which of the following? Options: A) Gram-negative, non-maltose fermenting diplococci B) Gram-negative, lactose-fermenting bacilli C) Gram-negative, oxidase-positive bacilli D) Gram-positive, optochin-sensitive diplococci " Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.