no–brain·er 
/ˈnoʊˈbreɪnɚ/ noun
plural no–brain·ers /ˈnoʊˈbreɪnɚ/ noun [count] informal : a decision or choice that is very easy to make and requires very little thought
▪ The offer of a full scholarship made his choice of colleges a no-brainer.
▪ The offer of a full scholarship made his choice of colleges a no-brainer.
