Carcinoma cervix is caused by :
**Core Concept**
Carcinoma cervix, also known as cervical cancer, is a malignant neoplasm of the cervix uteri, primarily caused by persistent infection with high-risk types of human papillomavirus (HPV). This condition is a leading cause of cancer-related deaths among women worldwide.
**Why the Correct Answer is Right**
HPV infection leads to the integration of viral DNA into the host genome, resulting in the activation of oncogenes and the silencing of tumor suppressor genes. This disruption of normal cellular regulation allows for uncontrolled cell growth and tumor formation. The high-risk types of HPV, such as HPV 16 and 18, are responsible for the majority of cervical cancers. The virus infects the basal cells of the cervix, leading to the development of dysplastic lesions, which can progress to invasive carcinoma if left untreated.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because while smoking and other risk factors can increase the risk of cervical cancer, they are not the primary cause.
* **Option B:** This option is incorrect because bacterial vaginosis, a common vaginal infection, is not associated with cervical cancer.
* **Option C:** This option is incorrect because while human immunodeficiency virus (HIV) infection can increase the risk of cervical cancer by impairing the immune system, it is not a direct cause of the disease.
**Clinical Pearl / High-Yield Fact**
It is essential to note that cervical cancer is a preventable disease through regular screening with Pap smear and HPV testing, as well as vaccination against high-risk HPV types.
**Correct Answer:** C. Human papillomavirus (HPV).