Final answer:
The best inference is that Eng died of sorrow after his brother Chang's death, indicating a deeply emotional and potentially psychosomatic response to loss.
Step-by-step explanation:
The best inference to make, based on the passage provided, is that Eng may have died of sorrow, missing his brother Chang after his sudden death. While cases of people dying shortly after a loved one have been anecdotally reported through history, these instances often elude concrete medical explanations. However, historical accounts and narratives, as in the examples provided, often suggest a profound emotional bond can significantly impact an individual's wellbeing following the loss of a close relative or loved one.