Some Bacteria Grow at 25 $\degree$ C or 42 $\degree$ C, but Diagnostic Laboratories Routinely Grow Pathogenic Bacteria at What

Some bacteria grow at 25 $\degree$ C or 42 $\degree$ C, but diagnostic laboratories routinely grow pathogenic bacteria at what temperature?

A) 30 $\degree$ C
B) 60 $\degree$ C
C) 35 $\degree$ C
D) 10 $\degree$ C