Which of the following is a characteristic of grade 1 medial collateral ligament sprain?
A. The superficial layer of the medial collateral ligament is completely torn.
B. There is a definite loss of passive range of motion.
C. The joint is stable during valgus stress tests.
D. There is a complete loss of medial stability.
Answer: C
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All of the following soluble factors enhance isotype switching from IgM to IgA in B cells except _____
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A. energy B. life C. health D. exercise