<prompt> Infection of submandibular space is seen in:Ludwig anginaVincent anginaPrinzmetal anginaUnstable angina  <response>: a Ludwig anginaRef. Scott Brown, 8th ed., Vol 3; 628; Stell Maran, 5th ed., 229Ludwig angina is infection of the submandibular space, i.e. floor of mouth.Vincent angina is ulcerative gingivitis along with involvement of the tonsils.Prinzmetal angina and unstable angina are the acute coronary syndromes. 