**Core Concept**
The question tests the contraindications for Intrauterine Contraceptive Devices (IUCDs), specifically highlighting the conditions or situations where their use is not recommended due to potential risks or adverse effects.

**Why the Correct Answer is Right**
IUCDs, particularly hormonal types like the Mirena, are contraindicated in **pelvic inflammatory disease (PID)** or active genital infections. This is because the insertion of an IUCD can potentially exacerbate the infection or increase the risk of spreading the infection to other parts of the reproductive tract. The presence of an active infection compromises the integrity of the uterine lining, making it an inappropriate time for IUCD insertion, as this could lead to complications such as increased pain, infection dissemination, or perforation.

**Why Each Wrong Option is Incorrect**
**Option A:** Although certain conditions like **cervical cancer** may be associated with an increased risk of IUCD insertion complications, it is not a contraindication per se. Cancer treatment might be considered after IUCD insertion in some cases.
**Option B:** **Previous uterine surgery** may influence the ease of IUCD insertion or the choice of IUCD type but is not a contraindication.
**Option C:** **Age** is not a direct contraindication for IUCD use; however, certain age-related considerations, such as the need for more frequent follow-up in adolescents, might be relevant.

**Clinical Pearl / High-Yield Fact**
The **Fitz-Hugh-Curtis syndrome**, characterized by inflammation of the liver capsule due to spread of infection from the female reproductive tract, is a potential complication of untreated PID, further underscoring the importance of avoiding IUCD insertion in such cases.

**Correct Answer: D. PID or active genital infections.**