This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, Subject name: Pharmacology
[{'content': 'Ethambutol should be used very cautiously in childhood tuberculosis due to which of its side effect? \nSelect and explain. \nA. Ocular toxicity, B. Renal damage, C. Hepatotoxicity, D. Clofazamine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a (Ocular toxicitv). (Ref. KD Trioathi, 5th ed., 704 & Harrison, Medicine 14th ed.. 428)DRUGS CAUSING OCULAR TOXICITY, MAINLY COLOR VISION ALTERATION# Barbiturates# Ethambutol (-red-green blindness)# Thiazides# Digoxin (yellow vision)# Sildenafil (Blue - green blindness)# Sulfonamides', 'role': 'assistant'}]