This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
For evaluating a case of recurrent spontaneous aboion, which of the following investigation is unwanted? 
Select and explain. 
A. Hysteroscopy, B. Testing for Antiphospholipid antibodies, C. Testing for TORCH infections, D. Thyroid function tests.
C: Testing for TORCH infections
Answer: C: Testing for TORCH infections 
Explanation: TORCH infections is not a cause of recurrent spontaneous aboion. Recurrent spontaneous aboion is defined as 3 or more consecutive pregnancy losses at 20 weeks or less or with fetal weights less than 500 grams. Causes and investigations includes : Chromosomal abnormalities: karyotypic evaluation of both parents Genital tract anatomical abnormalities : three-dimensional sonography, hysteroscopy Autoimmune Factors like SLE: antiphospholipid antibodies Alloimmune Factors Inherited Thrombophilias Endocrinological factors like progesterone deficiency, PCOS, diabetes mellitus, hypothyroidism Ref: Williams Obstetrics, 23e chapter 9.