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: Medicine
A man presents with fever, wt loss and cough: Mantoux reads an induration of 17 x 19 mm, Sputum cytology is negative for AFB. Most likely diagnosis is 
Select and explain. 
A. Pulm tuberculosis, B. Fungal infection, C. Viral infection, D. Pneumonia
A: Pulm tuberculosis
Answer: A: Pulm tuberculosis 
Explanation: None