Which article should be used in the blank to make the sentence grammatically correct? " He lives in ____ old house"

Which article should be used in the blank to make the sentence grammatically correct? " He lives in ____ old house"

جملے کو گرامر کے لحاظ سے درست کرنے کے لیے خالی جگہ میں کون سا مضمون استعمال کیا جائے؟
Explanation

He lives in an old house

 before the +ve degree adjective, we should use " an or a"

 old is the adjective and vowel so we select the option " an"