This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cornea, Subject name: Ophthalmology
[{'content': 'A patient on amiodarone is diagnosed to have cornea verticillata. What should be management: \nSelect and explain. \nA. Stop the drug, B. Penetrating keratoplasty, C. Lamellar keratoplasty, D. Observation', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. (a) Stop the drugRef: Parson's 20/e, p. 206; American Academy of Ophthalmologist: Cornea Section 8, p. 2009 - 2010/375; Cornea by Krachner 2/e, p. 365 - 69; Kanski 6/e, p. 321", 'role': 'assistant'}]