Most common cause of the first-trimester aboion is: (A) Chromosomal anomalies, (B) Infections, (C) Rh incompatibilty, (D) Cervical incompetence
Answer is A. Causes of 1st trimester aboion : Genetic factors -50% Endocrine disorders Immunological disorders Infection Unexplained Ref: Dutta Obs 9e pg 153.