All of the following are known causes of recurrent abortion except:

Ans. is a, i.e TORCH infectionRef. 'Pre test' Obstetrics and Gynaecology 11/e, p 68 (Question 77)As discussed in previous question TORCH infection do not lead to recurrent abortion.SLE is an established cause for recurrent abortionSLE is associated with antiphospholipid syndrome (anti-cardiolipin antibodies) and is known to cause recurrent abortions.RH incompatibility is a known cause for spontaneous abortion and may lead to recurrent abortions if it remains unrecognized.Syphilis as discussed in the text can lead to recurrent abortion.