Ans.C. Ludwig’s angina
>This is an infection of the submandibular space, i.e. floor of the mouth.
>The most common cause of Ludwig’s angina is dental Caries.
>The submandibular space is divided into 2 spaces by the mylohyoid muscle (also known as the oral diaphragm).
>The space above the mylohyoid is known as sublingual space. Here the infection spreads from premolar tooth.
>The space below the mylohyoid is known as submaxillary space laterally and submental space in the center.
>Infection to this space follows carious molars.
(Ref. Scott Brown, 8th ed., VoI 3;628)