Q117. An 8-year-old boy presents to the OPD for evaluation of a subcutaneous xanthoma on his right elbow. His father recently died of a myocardial infarction. Laboratory investigations reveal total cholesterol of 480 mg/dL, triglycerides of 146 mg/dL, and LDL cholesterol of 300 mg/dL. Which of the following types of familial hypercholesterolemia is the most likely underlying condition?