Sensitivity is the ability of a test to correctly identify those with a disease. It is also called the true positive rate.
Sensitivity = A/(A+B). In this case, this is 95/120 = 79.2%
Specificity relates to the ability of a test to correctly reject healthy patients without a condition. It is equal to the number of true negatives divided by the sum of true negatives and false negatives.
Specificity = D/(C+D). In this case, this is 140/160 = 87.5%