Guru Gobind Singh was the tenth guru of the Sikhs.
A.True
B.False

Hint: Guru Nanak is the founder of Sikhism. Guru means 'Teacher'. Sikhism is still based on his teachings and those of the nine Sikh Gurus who followed him.
Guru Gobind Singh was the Sikhs' tenth guru.

Complete answer:
He was the 10th Sikh Guru, born Gobind Rai (22 December 1666 to 7 October 1708). Guru Gobind Singh was formally elected as the leader of the Sikhs at age nine, becoming the tenth Sikh Guru, when his father, Guru Tegh Bahadur, was decapitated for refusing to convert to Islam. During his lifetime, his four sons died - two in battle, two executed by the Mughal army. He was a spiritual master, a warrior, a philosopher, and a poet. Before and after the institution of the Khalsa in 1699, numerous battles were fought by Guru Gobind Singh against the Rajput and Mughal rulers.

Founding the Sikh warrior group named Khasa in 1699 and introducing the five K's, the five articles of faith that Khalsa Sikhs wear at all times are among his notable contributions to Sikhism.
With the conviction that their destiny was to rule, he had driven the Khalsa. Each move that Gobind Singh made was calculated to instil in his Sikhs a fighting spirit. He developed a body of poetry and music for martial purposes.
In the minds of Sikhs today, Gobind Singh stands as the ideal of chivalry, the Sikh soldier-sain.

Hence, the correct answer is option (A)

Note: Gobind Singh proclaimed that he was the last of the personal Gurus. From that point forward, the Sikh Guru was to be the holy book. The largest guru granth sahib is kept in Golden temple, Amritsar.