The correct answer is option 'B' which states that the total number of bones in the hind limb of a man is 30.

The hind limb, also known as the lower limb, is the lower appendage of the human body that extends from the hip to the foot. It consists of several bones that work together to provide support, stability, and movement.

The bones in the hind limb can be divided into three main regions: the pelvic girdle, the thigh, and the leg/foot. Let's discuss each region and the bones present in them:

1. Pelvic Girdle:
- The pelvic girdle consists of two hip bones, also known as the coxal bones or innominate bones.
- Each hip bone is made up of three fused bones: the ilium, ischium, and pubis.
- Therefore, the pelvic girdle has a total of 2 bones.

2. Thigh:
- The thigh bone is called the femur, which is the longest and strongest bone in the human body.
- Therefore, the thigh has a total of 1 bone.

3. Leg/Foot:
- The leg consists of two bones: the tibia and fibula.
- The tibia is the larger and stronger bone, located on the medial side of the leg. It bears most of the body's weight.
- The fibula is the smaller bone, located on the lateral side of the leg. It provides support and muscle attachment.
- Therefore, the leg has a total of 2 bones.

- The foot consists of several bones, including the tarsals, metatarsals, and phalanges.
- There are 7 tarsal bones in the foot: talus, calcaneus, navicular, cuboid, and the three cuneiform bones.
- There are 5 metatarsal bones in the foot, which are located in the midfoot region.
- There are 14 phalanges in the foot, divided into proximal, middle, and distal phalanges.
- Therefore, the foot has a total of 26 bones (7 tarsals + 5 metatarsals + 14 phalanges).

Adding up the bones from each region:
Pelvic Girdle: 2 bones
Thigh: 1 bone
Leg: 2 bones
Foot: 26 bones

Total number of bones in the hind limb = 2 + 1 + 2 + 26 = 31

Therefore, the correct answer is not option 'B' but seems to be option 'D' which states that the total number of bones in the hind limb of a man is 21.