Trochanters occur in
(a) Humerus
(b) Femur
(c) Radio-ulna
(d) Tibia-fibula

Options

A. Humerus
B. Femur
C. Radio-ulna
D. Tibia-fibula

Answer

To determine where trochanters occur, we can follow these steps:

1. **Understand the Definition of Trochanters**: Trochanters are bony structures that serve as important attachment points for muscles. They are specifically associated with the femur, which is the thigh bone.

2. **Analyze the Options**: We have four options to consider:
- (a) Humerus: This is the bone of the upper arm.
- (b) Femur: This is the thigh bone, which is known to have trochanters.
- (c) Radio-ulna: These are the bones of the forearm.
- (d) Tibia-fibula: These are the bones of the lower leg.

3. **Identify the Correct Bone**: Since trochanters are specifically found near the end of the thigh bone, the femur is the only option that contains trochanters.

4. **Conclusion**: Therefore, the correct answer is (b) Femur.