This Historic Character Observed That Childbed Fever Mortality Was More

This historic character observed that childbed fever mortality was more common among women treated by physicians and medical students compared with women treated by midwives.Based on his observations,he implemented a hand wash policy that resulted in a decrease in mortality.Name the character that we are talking about.

A) John Snow
B) Edward Jenner
C) D.A. Henderson
D) Leon Gordis
E) Ignaz Semmelweis