If the pelvic bones do not fuse,how many bones are present in an adult human?

Olecranon fossa is present over

Which is the longest bone in the human skeletal system?

Choose the correct option $:-$
$(a)$ First seven pairs of ribs are called true ribs.
$(b)$ Sternum is a large triangular bone that is situated at the ventral part of the thorax.
$(c)$ Scapula has a slightly elevated ridge called the spine which projects as a flat,expanded process called the acromion.
$(d)$ Below the acromion is a depression called the glenoid cavity which articulates with the head of the humerus.

Match the following columns:

Column-$I$	Column-$II$ (Number of bones)
$P$. Arm	$I$. $8$
$Q$. Forearm	$II$. $5$
$R$. Wrist	$III$. $14$
$S$. Palm	$IV$. $1$
$T$. Digits	$V$. $2$

Colles' fracture is associated with