In this task, you will be presented with a context passage, a question about that paragraph, and a possible answer to that question. The task is to check the validity of the answer. Answer with "Yes" or "No".

Ex Input:
Fossils can be used to match up rock layers. As organisms change over time, they look different. Older fossils will look different than younger fossils. Some organisms only survived for a short time before going extinct. Knowing what organisms looked like at certain times also helps date rock layers. Some fossils are better than others for this use. The fossils that are very distinct at certain times of Earths history are called index fossils. Index fossils are commonly used to match rock layers. You can see how this works in Figure 2.30. If two rock layers have the same index fossils, then they're probably about the same age. <sep>What kind of fossils are used to date rock layers?<sep>Index fossils

Ex Output:
Yes


Ex Input:
The day was just breaking, as I left the tower; though it was still too dark in the house to be able to see without a light, and I took one of the study candles with me on my 'round.  By the time I had finished the ground floor, the daylight was creeping in, wanly, through the barred windows.  My search had shown me nothing fresh.  Everything appeared to be in order, and I was on the point of extinguishing my candle, when the thought suggested itself to me to have another glance 'round the cellars.  I had not, if I remember rightly, been into them since my hasty search on the evening of the attack.  For, perhaps, the half of a minute, I hesitated.  I would have been very willing to forego the task--as, indeed, I am inclined to think any man well might--for of all the great, awe-inspiring rooms in this house, the cellars are the hugest and weirdest.  Great, gloomy caverns of places, unlit by any ray of daylight.  Yet, I would not shirk the work.  I felt that to do so would smack of sheer cowardice.  Besides, as I reassured myself, the cellars were really the most unlikely places in which to come across anything dangerous; considering that they can be entered, only through a heavy oaken door, the key of which, I carry always on my person. <sep>What are great, gloomy caverns of places?<sep>Sheds

Ex Output:
No


Ex Input:
The protagonist Preetam ( ( ( Ganesh , on a visit to Eva Mall amidst a heavy wind , spots a pretty girl , Nandini .  While staring at her , he inadvertently falls into a manhole .  Nandini rescues him from the pit , but in the process loses her heart-shaped watch she had just bought .  While accompanying his mother to Madikeri , Preetam confronts a man named Jaanu .  Jaanu , who has been following Nandini , beats up Preetam thinking that he is in love with Nandini .  Preetam , unaware that Jaanu has vowed not to allow any one near Nandini , trashes Jaanu and his gang in return .  In Madikeri , Preetam meets Nandini unexpectedly .  He identifies himself and expresses his love towards her and offers to tie the watch as an indication for their marriage .  Nandini , who is already engaged rejects his request .  Still , Preetam vows to marry Nandini if she meets him again .  In the meantime , Preetam discovers that his host in Madikeri , Col. Subbayya is Nandini's father , who is pretty much deaf , and Nandini's marriage is a just a week away .  Dejected , Preetam throws Nandini's heart-shaped watch away .  But Nandini calls him over the phone and taunts him to return .  Delighted , Preetam goes in search of her watch and brings it back .  While searching it , he spots a rabbit , Which he calls Devadas , and brings it along with him .  Since Nandini's friends are due to arrive from Mumbai for the marriage , Preetam takes Nandini to the railway station .  The train from Mumbai is delayed by five hours , so Nandini and Preetam decide to visit a nearby hill-temple . <sep>Who did Preetam confront that had also been following Nandini?<sep>The friends

Ex Output:

No


