Definition: Construct a question that every answer in the list is correct and reasonable for it.

Positive Example 1 -
Input: umbrella, sunscreen, sun hat, sunglasses, cover up, shade
Output: at the beach, name something that might protect you from sun.

Positive Example 2 -
Input: bed, shower, tv, toilet, electricity, air conditioner, computer
Output: after a week of camping, what luxury at home are you most excited to have again?

Negative Example 1 -
Input: umbrella, sunscreen, sun hat, sunglasses, cover up, shade
Output: aside from animals name something people hunt for

Negative Example 2 -
Input: bed, shower, tv, toilet, electricity, air conditioner, computer
Output: at the beach, name something that might protect you from sun.

Now complete the following example -
Input: c, e, b, a
Output: 



Answer: name a letter of the alphabet that is also a vitamin?