The data for feed consumption and weight gain of our four farm animals labelled P,Q,R and S are shown below.

Use the data to answer this question correctly 

P: 50kg feed consumed and 20kg weight gained.

Q: 90kg feed consumed and 30kg weight gained.

R: 100kg feed consumed and 25kg weight gained.

S: 150kg feed consumed and 30kg weight gained.

Which of the animals is the most efficient feed converter?

A.

P

B.

Q

C.

R

D.

S

Correct answer is A

No explanation has been provided for this answer.