Answer:
He faced recurrences of the disease in 1999 and 2006.
Marco Polo was an Italian merchant, explorer, and writer, born in the Republic of Venice. His travels are recorded in Livre des merveilles du monde, a book that described to Europeans the wealth and great size of China, its capital Peking, and other Asian cities and countries
A laborer undergoes physical or mental exertion of mind or body with a view to earn in return. A laborer who works on an oil rig is called as a roughneck.
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Who is a laborer?</h3>
A laborer is referred to as a person who undergoes physical or mental exertion of mind or body with a view to earn something in monetary terms in exchange for the labor he/she provides.
A laborer is of different types and may be called by different names, irrespective of the kind of work or labor he provides. Likewise, a laborer who works on an oil rig is called as a roughneck. It is to be noted that a laborer is an important factor of production.
Hence, option B; a laborer who works on an oil rig is called as a roughneck is correct.
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