Which of the is the most common site for the occurrence of a basal cell carcinoma?

The microorganism most commonly cultured from a chronic bilateral ulcer at the corner of mouth________?

Herpangina is caused by________?

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

Osteosarcoma characteristically may develop in some causes of________?

A 3-year old patient has extensive vesicles on lip, tongue, oral mucous membrane, After 2-4 days vesicles rupture at followed by pseudomembrane formation and also some dermal lesions seen what will be the diagnosis?