How can i get specific rows of a matrix without using loops?

My question is, how can I get matrix c in an efficient way?(no loops)

c represents the rows of a, given b.

a=[10 14 12 15

     12 11 12 18

     11 14 28 15

     18 11 15 18

     20 11 45 85] 

b=[1

     4 

     2]  

c=[10 14 12 15

     18 11 15 18

     12 12 12 18]

Thank you in advance

Answer 1

[Bob Thompson]

c = a(b,:);