212. Most common primary malignant tumour of long bones is

a.Osteosarcoma
b.Multiple myeloma
c.Ewings sarcoma
d.Metastatic carcinoma

Ans:a.Osteosarcoma

Explanation:osteosarcoma is the commonest primary malignant tumour of long bones and Multiple myeloma is the commonest primary malignant tumour. (Ref robbins 7th ed)

211. Low bone mass is seen in:

1. Paget’s disease.
2. Rickets.
3. Osteomalacia.
4. None of the above

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