A doctor who treats children

In the following questions, out of four alternatives choose the one which can be substituted for the given words/ sentence.

A doctor who treats children

(1) paediatrician
(2) pedagogue
(3) pedestrian
(4) paedophile

Answer :-

(1) paediatrician

Explanation :-

paediatrician (N.) : a doctor who treats children
pedagogue (N.) : a teacher
pedestrian (N.) : a person walking and not travelling in a vehicle
paedophile (N.) : a person who is sexually attracted to children