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: Social & Preventive Medicine
[{'content': 'Anti-tubercular drug not given in children < 6 years age is \nSelect and explain. \nA. Ethambutol, B. Isoniazid, C. Streptomycin, D. Rifampicin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ethambutol may cause ‘optic neuritis’ (ocular toxicity): It may lead to ‘red-green color blindness’ and patients may\xa0thus develop ‘blue vision’\nThus it is contraindicated in children < 6 years age, as they may not be able to report any deterioration of color vision', 'role': 'assistant'}]