You are answering a USMLE-style medical question. Question: A 35-year-old woman presents to the emergency department after losing consciousness at work. On presentation, she is found to be somnolent though she is able to be woken by vocal stimuli. She says that over the last 12 hours, she has been experiencing muscle spasms, blurred vision, dry mouth, and hallucinations. She says that the symptoms started after she went on a hike in the woods and foraged from plants along the way. Physical exam reveals dry red skin and enlarged pupils. Her bladder is also found to be completely full though she says she is unable to urinate. Which of the following drugs would most likely be administered to this patient to treat her symptoms? Options: A) Atropine B) Physostigmine C) Pyridostigmine D) Neostigmine Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.