To solve this problem, we need to identify which organ is surgically removed during a hysterectomy.$\newline \bullet$Option 1: Uterus - A hysterectomy is the surgical removal of the uterus. This is the correct option.$\newline \bullet$Option 2: Prostate gland - The prostate gland is not related to a hysterectomy.$\newline \bullet$Option 3: Vas deferens - The vas deferens is part of the male reproductive system and is not removed in a hysterectomy.$\newline \bullet$Option 4: Mammary glands - The mammary glands are not removed in a hysterectomy.$\newline$Therefore, the correct answer is Option 1: Uterus.