Based on the information present in the given passage, you need to write a correct answer to the given question. A correct answer is one that correctly and completely answers the question. Do not write answers that address the question partially or incorrectly. The correct answer must be contained in the given paragraph.

[EX Q]: Paragraph- Sent 1: He continued to lie in place, still breathing heavily.
Sent 2: I tried to keep myself calm.
Sent 3: Then, with a sigh, he said, "I have need of a certain stone that I once possessed.
Sent 4: It would allow me to leave this bed, despite my current illness.
Sent 5: My problem is that it was not made in this realm, but by a human, and only a human may handle it.
Sent 6: The herb vendor will tell you where you can find it.
Sent 7: If you would fetch me this stone, I would tell you what I can." "Of course we will fetch you the stone," Nepthys assured him.
Sent 8: "You have our thanks." Outside, the thing at the herb cart nodded when we mentioned the stone.
Sent 9: He told Nepthys the name of a woman who lived on a certain street, and we set off.
Sent 10: When we reached the street, I expected some sort of temple, or a row of antiquaries, or at least a sleazy, black-market relics merchant.
Sent 11: Instead, it looked like we were in the red-light district: women who probably wanted more than our money eyed us from the alleys.
Sent 12: Nepthys didn't need to warn me not to speak to them.
Sent 13: He took us to the door of a building like a short pagoda that had a sign hanging over it showing a face with hands uplifted, like a saint under G d's light, and handcuffed.
Sent 14: Inside, the entrance room was hung with bright silks and scattered with velvet cushions.
Sent 15: Sails of obscene orange and a green that insulted springtime hung draped across reds that might have been sensual elsewhere but here were only offensive.
Sent 16: A large woman, similarly decorated, quickly drifted up to us.
Sent 17: "Good evening, gentlemen," she said.
Sent 18: "May I invite you to have a cup of tea?" "No, thank you," said Nepthys, "we regret that we cannot take up your kind offer.
Sent 19: Are you the proprietor of this shop?" "Yes," answered the woman.
Sent 20: "I am Madame Entera, at your service. 
Question: Who is Madame Entera?.
[EX A]: The Large woman.

[EX Q]: Paragraph- Sent 1: Fossils can be used to match up rock layers.
Sent 2: As organisms change over time, they look different.
Sent 3: Older fossils will look different than younger fossils.
Sent 4: Some organisms only survived for a short time before going extinct.
Sent 5: Knowing what organisms looked like at certain times also helps date rock layers.
Sent 6: Some fossils are better than others for this use.
Sent 7: The fossils that are very distinct at certain times of Earths history are called index fossils.
Sent 8: Index fossils are commonly used to match rock layers.
Sent 9: You can see how this works in Figure 2.30.
Sent 10: If two rock layers have the same index fossils, then they're probably about the same age. 
Question: What helps to date rock layers?.
[EX A]: Index fossils.

[EX Q]: Paragraph- Sent 1: Is this an insect or an animal?
Sent 2: A snail is an animal just like you and me.
Sent 3: Thats right, you too are an animal.
Sent 4: No, you don't look like a snail.
Sent 5: You do have some things in common.
Sent 6: Animals can be divided into many groups.
Sent 7: These groups are decided based on their characteristics.
Sent 8: All animals have some basic features in common.
Sent 9: That does not mean they are the same.
Sent 10: They also have many differences.
Sent 11: For example, snails are mollusks and not insects.
Sent 12: Mollusks have a unique set of features.
Sent 13: Notice the large foot that allows it to move.
Sent 14: Yes, it only has one foot.
Sent 15: Did you notice the long antennas on its head?
Sent 16: This is where the snail's eyes are.
Sent 17: They are on the end of the antenna.
Sent 18: They are not on its head like most animals.
Sent 19: The foot and eyes are unique features.
Sent 20: Scientists use these features to place animals into groups. 
Question: What are snails' unique features?.
[EX A]:
Large foot that allows it to move.

