**Core Concept**
Asherman syndrome is a rare condition characterized by the formation of adhesions or scar tissue in the uterus, often leading to menstrual abnormalities and infertility. This condition is typically acquired as a result of uterine trauma, such as surgical procedures or infections.

**Why the Correct Answer is Right**
Postabortion curettage is a common cause of Asherman syndrome. During a dilation and curettage (D&C) procedure, the uterine lining is scraped to remove any remaining tissue. However, if the curettage is too aggressive or if the uterus is not properly prepared, it can lead to the formation of adhesions. These adhesions can cause the uterine cavity to become smaller, leading to symptoms such as amenorrhea, oligomenorrhea, or infertility. The formation of adhesions is due to the body's natural response to injury, which involves the deposition of fibrin and subsequent scarring.

**Why Each Wrong Option is Incorrect**
**Option A:** Overdose of drugs is not a known cause of Asherman syndrome. While certain medications may affect uterine function, they are not directly linked to the development of adhesions.
**Option C:** Septicemia, or blood infection, can lead to uterine damage and scarring, but it is not a primary cause of Asherman syndrome. Septicemia is a more systemic condition that can affect multiple organs, whereas Asherman syndrome is a localized condition affecting the uterus.
**Option D:** Contraceptive pills are not a known cause of Asherman syndrome. While certain types of contraception may affect uterine function, they do not typically lead to the formation of adhesions.

**Clinical Pearl / High-Yield Fact**
Asherman syndrome can be diagnosed using ultrasound or hysteroscopy, and treatment options may include hormonal therapy, intrauterine insemination, or surgery to remove the adhesions. It is essential to recognize the symptoms of Asherman syndrome, as early diagnosis and treatment can improve fertility outcomes.

**✓ Correct Answer: B. Postabortion curettage.**