Answer:
B. Grade II
Step-by-step explanation:
Based on the description provided:
- Momentary confusion
- Retrograde amnesia lasting 5 to 10 minutes
This aligns with the typical classifications of concussions or mild traumatic brain injuries (mTBIs). Different grading systems have been proposed for concussions over the years. One of the commonly used systems divides concussions into three grades:
1. Grade I (mild): Transient confusion, no loss of consciousness, and symptoms clear within 15 minutes.
2. Grade II (moderate): Transient confusion, no loss of consciousness, but symptoms last longer than 15 minutes.
3. Grade III (severe): Any loss of consciousness, either brief (seconds) or prolonged (minutes).
Given the details you've provided, the injury would be categorized as:
B. Grade II