[{"_id":ObjectId("60a4bbd1753b2bb53e6f7dba"),"name":"Bob","class":7.0,"lessons":["english","mathematics"],"avgScore":3.5,"parents":[{"gender":"female","name":"Ira"},{"gender":"male","name":"Dima","profession":"programmer"}]}]

db.collection.find({parents:{$elemMatch:{profession:"programmer"}}},{"parents.profession.$":1})