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Directions: You have a passage followed by questions based on it. Read the passage carefully and choose the best answer to each question out of the four alternatives.

The dog is a very intelligent animal and it can be trained for many duties. Some dogs work with the police and the army as sentries and trackers and there are medals that are awarded to dogs for bravery in action. Other dogs act as seeing eyes for the blind and some breeds are specially trained for rescue work among mountains and snow. Jobs like herding sheep and cattle and guarding homes are also done by them. Whenever man lives and works in the Arctic circle, in the desert, in the jungle, in the moors or mountains, the dog is his faithful companion and help. A common mongrel may possess these qualities just as much as the aristocratic blood hound.

The phrase 'aristocratic blood hound' in the passage means-

A)  the dog kept by wealthy people.

B)  a pedigree dog.

C)  a dog fond of blood.

D)  any big dog.