Dens evaginatus is most commonly found in:

 # Dens evaginatus is most commonly found in:

A. Premolar

B. Lateral incisor

C. Canine

D. Molar

The correct answer is A. Premolar.

Dens evaginatus or leong's premolar or evaginated odontome or occlusal tuberculated premolar is a developmental condition that appears as an accessory cusp or a globule of enamel between the buccal and lingual cusps of premolars, unilaterally or bilaterally, though it had been known to rarely occur on molars, cuspids and incisors.

Which of the following lesions/conditions is not caused by virus?

 # Which of the following lesions/conditions is not caused by virus?

A. Koplik’s spots

B. Herpetiform ulcers

C. Herpes labialis

D. Ramsay-Hunt syndrome

The correct answer is B. Herpetiform ulcers.

Koplik's spots are seen in the buccal mucosa in patients with measles, which is an infection caused by paramyxovirus. Herpes labialis is caused by the herpes simplex virus and Ramsay-Hunt syndrome is due to herpes zoster of the geniculate ganglion. Herpetiform ulcers are a type of aphthous ulcer and are not caused by a virus. Lyme disease is caused by Borrelia burgdorferi, a spirochaetal bacterium, and is spread via ticks. 

Which of the following does not cause oral cancer in children?

 # Which of the following does not cause oral cancer in children?

A. Herpes simplex

B. Epstein barr

C. Cytomegalovirus

D. Varicella zoster

The correct answer is D. Varicella zoster.

HSV has been possibly associated with hit and run mechanism in oral cancer causation. Epstein barr virus causes African jaw lymphoma, CMV possibly is associated with Kaposi's sarcoma. Hence Herpes zoster is the best option. 

Osteoblastic secondaries are present in which carcinoma?

 # Osteoblastic secondaries are present in which carcinoma?

A. Carcinoma lung

B. Carcinoma breast

C. Carcinoma urinary bladder

D. Carcinoma prostate

The correct answer is D. Carcinoma prostate.

Although most of such metastases produce osteolytic lesions and thus appear as a radiolucency, certain tumors produce osteoblastic lesions or lesions and are most often associated with carcinoma of the prostate, and occasionally, of the breast and lung.