Which of these is the most populated country of Africa?

Nigeria, officially the Federal Republic of Nigeria, is a country in West Africa, bordering Niger in the north, Chad in the northeast, Cameroon in the east, and Benin in the west. I

Nigeria is often referred to as the "Giant of Africa", owing to its large population and economy. With 186 million inhabitants, Nigeria is the most populous country in Africa and the seventh most populous country in the world. Nigeria has the third-largest youth population in the world, after India and China, with more than 90 million of its population under the age of eighteen. Nigeria is the world's 20th largest economy as of 2015, worth more than $500 billion and $1 trillion in terms of nominal GDP and purchasing power parity, respectively. The 2013 debt-to-GDP ratio was 11 percent.

Nigeria is viewed as a multinational state as it is inhabited by 250 ethnic groups, of which the three largest are the Hausa, Igbo and Yoruba; these ethnic groups speak over 500 distinct languages and are identified with a wide variety of cultures. The official language of Nigeria is English, chosen to facilitate linguistic unity at the national level. Nigeria is divided roughly in half between Christians, who live mostly in the southern part of the country, and Muslims, who live mostly in the north. A minority of the population practice religions indigenous to Nigeria, such as those native to the Igbo and Yoruba ethnicities.