## **Core Concept**
The patient's presentation of post-coital bleeding and a visible growth on the cervix is highly suggestive of a cervical malignancy, most likely cervical cancer. The immediate next step in management would be to obtain a tissue diagnosis.

## **Why the Correct Answer is Right**
The correct answer, **. (Biopsy of the cervical growth)**, is the most appropriate next investigation because it directly addresses the need for a tissue diagnosis to confirm or rule out cervical cancer. Post-coital bleeding is a red flag symptom for cervical cancer, and a visible growth on the cervix further increases the suspicion. A biopsy would provide histopathological evidence of the nature of the growth.

## **Why Each Wrong Option is Incorrect**
- **Option A: (Pap smear)**. While a Pap smear is a screening tool for cervical cancer, it is not the next best step when a visible growth is already present. A Pap smear can provide cytological evidence but is not diagnostic in the presence of a visible lesion.
- **Option B: (Imaging studies like MRI or CT scan)**. These might be useful for staging if cancer is confirmed, but they do not provide a tissue diagnosis.
- **Option D: (Colposcopy)**. This might be useful if the lesion is not visible or if there is a suspicion of a lesion that is not overtly visible, but when a visible growth is present, proceeding directly to biopsy is more appropriate.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that any visible cervical lesion, especially in the context of post-coital bleeding, should be considered malignant until proven otherwise. Therefore, obtaining a biopsy of such lesions is crucial for early diagnosis and management of potential cervical cancer.

## **Correct Answer:** . Biopsy of the cervical growth