
| List - I (Machine Parts) | List - II (Their Features) |
|---|---|
| (A) Bolt | (I) A machine part having a threaded hole |
| (B) Nut | (II) A cylindrical piece having threads at both ends |
| (C) Washer | (III) A cylindrical body with one end threaded and other end in form of Head |
| (D) Stud | (IV) A circular plate having a hole in its centre |

Rearrange the following parts to form a meaningful and grammatically correct sentence:
P. a healthy diet and regular exercise
Q. are important habits
R. that help maintain good physical and mental health
S. especially in today's busy world