The tests indicated that poultry feed in the country had also been contaminated, as samples of chicken and fish contained traces of antibiotics. The preceding statement proves that-
A. tests are administered to figure out contamination
B. Poultry feed has a positive effect on chickens
C. tests used to check the poultry feed are insignificant
D. Antibiotics are deliberately added to poultry feed
E. Chickens, which are fed contaminated poultry feed are cured with antibiotics
সঠিক উত্তরঃ
D.
Antibiotics are deliberately added to poultry feed
Explanation: 
