Passage Summary: Doctors find more strokes on the left side of the brain than the right, which leads the author to believe that right-side strokes are just harder to spot or less obvious.

Conclusion: Strokes occurring in the right side of the brain are more likely to go undiagnosed than those in the left side.

Reasoning: A study showed that the majority of strokes actually diagnosed by doctors were located in the left side of the brain.

Analysis: To support the idea that right-side strokes are specifically *undiagnosed*—rather than simply being less frequent—we need a reason why they would be harder for a doctor to identify. If left-side strokes produce very obvious, classic symptoms while right-side strokes are subtle or asymptomatic, that would explain the discrepancy. Look for an answer that highlights a difference in how symptoms manifest between the two sides.