Likelihood ratio for positive results is;: (A) Sensitivity / (1-specificity), (B) Specificity / (1-Sensitivity), (C) (1-Sensitivity) / Specificity, (D) (1-specificity) / Sensitivity
Answer is A. Likelihood ratio for Positive :
       LR+= Sensitivity / (1-specificity)
Likelihood Ratio for Negative :
      LR- = (1-Sensitivity) / Specificity