Karachi is older than most other cities in Pakistan. (Make it Superlative)

- Than most other/ than few other যুক্ত Comparative Degree কে Superlative Degree তে রূপান্তরের নিয়মঃ
- Structure:- Subject + Verb + one of the + Comparative Degree-এর Superlative form + most other/ few other এর পরের অংশ।

So, the correct answer is: Karachi is one of the oldest cities in Pakistan.