This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
What is the standard dose of PPD for Mantoux test - 
Select and explain. 
A. 5TU, B. 10TU, C. 15TU, D. 20TU
A: 5TU
Answer: A: 5TU 
Explanation: <p> A standard 5 tuberculin unit(5 TU) of PPD-S is used in Mantoux test. Reference:Park&;s textbook of preventive and social medicine,K.Park,23rd edition,page no:185. <\p>