This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Ethambutol causes : 
Select and explain. 
A. Retrobulbar neuritis, B. Deafness, C. Red urine, D. Peripheral neuritis
A: Retrobulbar neuritis
Answer: A: Retrobulbar neuritis 
Explanation: Ethambutol causes retrobulbar neuritis and can result in red-green colour blindness.