This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: obstetrics,pediatrics and geriatrics, Subject name: Social & Preventive Medicine
Whic of the following is categorised as a high risk pregnancy? 
Select and explain. 
A. Bih order 3, B. Maternal height 150 cm, C. Twins pregnancy, D. Blood group AB +ve
C: Twins pregnancy
Answer: C: Twins pregnancy 
Explanation: High risk cases include : Elderly primi (>30years) Sho statured primi (<140cm) Malpresentations Antepaum haemorrhage, threatened aboion Pre-eclampsia and eclampsia anemia Twins Previous still bih, Intrauterine death, manual removal of placenta elderly grandmultiparas prolonged pregnancy history of caesarean or instrumental delivery Pregnancy associated with general diseases Treatment for infeility Three or more consecutive spontaneous aboions