1.  By which numbers trained nurses are represented ?
A. 3, 6
B. 7, 5
C. 5, 6
D. 1, 5

Answer: Option C

Explanation:

Option A = 3, 6 ; Here 3 is 'just only a married population'.
Option B = 7, 5 ; Here 7 is 'married nurses in hospital but not trained'.
Option D = 1, 1 ; Here 1 is 'nurses in hospital but not trained'.

But, Option C = 5, 6 ; Here both 5 & 6 are covered with 'Trained nurses'. Hence the required answers.