A middle-aged patient arrived at the clinic with an abrupt onset of chest pain and

A middle-aged patient arrived at the clinic with an abrupt onset of chest pain and shortness of breath, exhibiting hypotension and a pulse oximeter reading of 85% saturation. Subsequent assessment revealed significantly elevated D-dimer levels. Consequently, the patient was urgently transported by ambulance to a nearby hospital, where a chest CT scan confirmed the presence of a massive pulmonary embolus. What is the most likely source of this pulmonary embolus? Group of answer choices Veins in the pelvis Deep veins in the lower leg A thrombus in the right ventricle of the heart A thrombus in the right ventricle of the heart

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