This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fetal Skull and Maternal Pelvis, Subject name: Gynaecology & Obstetrics
Triradiate pelvis is see in: 
Select and explain. 
A. Rickets, B. Chondrodystrophy, C. Osteoporosis, D. Hyperparathyroidism
C: Osteoporosis
Answer: C: Osteoporosis 
Explanation: Ans. is c, i.e. OsteoporosisOsteomalacia or deficiency of Calcium and Vitamin D shows triradiate pelvis. Since osteomalacia is not given here we are going for osteoporosis.