unidentifed
Breaking down the answer what you needed to identify:
- exhaustion stage of GAS
- impact on heart as stated by question
- plausible connection between the two based on your knowledge of stress
I doubt they would expect you to know the whole question on your own but with the question having told you that he developed a heart condition makes the question a lot more reasonable than it otherwise could have been.
Edit: you should know it's exhaustion stage because that where major illness is more likely to occur, minor colds can however occur towards the end of resistance.
