Diya's aunty has made a list of objects with their weights. Find the incorrect statement of the following: P: Weight of a mug full of coffee is about 450 gm. Q: Weight of a thread roll is about 2 kg R: Weight of a letter is about 5 g. S: Weight of a pair of Chappals is about 200 gm.

• A.  S  
• B.  R
• C.  Aero plane     
• D.  P