**Core Concept**
The question tests the student's knowledge of **spermicides**, specifically those containing **non-oxynol-9**, and their effectiveness against **sexually transmitted diseases (STDs)**. The underlying principle involves the **mechanism of action** of non-oxynol-9 and its effects on various pathogens.

**Why the Correct Answer is Right**
Non-oxynol-9 is a **surfactant** that works by disrupting the cell membranes of sperm, thereby preventing fertilization. However, its effectiveness against STDs, including **HIV**, **gonococci**, and **chlamydia**, is limited. While non-oxynol-9 may have some **in vitro** effects on these pathogens, its use as a spermicide does not provide reliable protection against STDs.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because non-oxynol-9 does not have a significant apoptotic effect on HIV, gonococci, and chlamydia that would provide effective protection against STDs.
**Option B:**
**Option C:**

**Clinical Pearl / High-Yield Fact**
It is essential to remember that **no spermicide**, including those containing non-oxynol-9, provides complete protection against STDs. **Condoms** are the most effective method for preventing the transmission of STDs.

**Correct Answer:** D.