What might happen to a head to cause losing consciousness?
Options:
- injury
- coma
- death
- a blow
- falling down
Let's think now! Step-by-step reasoning:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Injury is said to damage the part where it happens. Injury on head can result in losing consiciousness.
So, the final answer is injury.