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: Pediatrics
A 2 year old child has a Mantoux test reading of 12 mm × 12 mm after 48 hours. In this case : 
Select and explain. 
A. Anti – TB drugs should be started even if x–ray chest and haemogram are normal, B. Treatment should be started only if x–ray chest and haemogram are suggestive, C. One should wait till overt sign of TB appear, D. No treatment is required
A: Anti – TB drugs should be started even if x–ray chest and haemogram are normal
Answer: A: Anti – TB drugs should be started even if x–ray chest and haemogram are normal 
Explanation: Positive tuberculine test in 2 yrs. old child confirms T.B.