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
Anti-tubercular drug not given in children < 6 years age is 
Select and explain. 
A. Ethambutol, B. Isoniazid, C. Streptomycin, D. Rifampicin
A: Ethambutol
Answer: A: Ethambutol 
Explanation: Ethambutol may cause ‘optic neuritis’ (ocular toxicity): It may lead to ‘red-green color blindness’ and patients may thus develop ‘blue vision’
Thus it is contraindicated in children < 6 years age, as they may not be able to report any deterioration of color vision