question: What does research show about the FBO effect ?
answer: this may be of immunological origin , caused by a maternal immune reaction against a substance crucial to male fetal development during pregnancy ,
turker_answer: Research shows the FBO effect may be of immunological origin , and caused by a maternal immune reaction against a substance crucial to male fetal development during pregnancy .
rule-based: Research shows this may be of immunological origin , caused by a maternal immune reaction against a substance crucial to male fetal development during pregnancy about the FBO effect .