Premise: Challenged by the Human Rights Campaign's Elizabeth Birch in the letters column of the Dec. 8 Standard , Bennett, remarkably, dug in to defend the Cameron numbers, which he said coincided with the views of other authorities such as psychiatrist . Satinover's 1996 book, Homosexuality and the Politics of Truth , does discuss gay life spans, but cites as its authority ...

Hypothesis: Elizabeth Birch of the Human Rights Campaign challenged iy in letters. 
Relation: entailment