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: Ophthalmology
A 10-year boy present with bilateral chronic uveitis. Which investigation should be ordered – 
Select and explain. 
A. Hemogram, B. X–ray of sacroiliac joint, C. HIV test, D. Mantoux test
D: Mantoux test
Answer: D: Mantoux test 
Explanation: Investigations used in the evaluation of uveitis
Anterior
Acute:- Urine for WBC, CBC, ESR, CRP, X-ray sacroiliac joint, HLA B-27, Chest X-ray, VDRL & FTA-ABS for syphilis, Serum ACE, Mantoux test
Chronic:- Gonioscopy, Antinuclear antibody
Posterior
Acute:- None
Chronic:- Eosinophil count, serum ACE, ELISA for toxoplasma & toxocariasis, chest X-ray, Mantoux test,
Virus cultures, serum antibodies in suspected cases of CMV, HSV, VZV