Task: Text Categorization
Input (English): The statement "Ik Onkar" is a central belief in this faith and is the first line of its Mul Mantra. The Khanda is an important symbol of this religion, which also shows a rejection of the caste system by mandating a single surname for male practitioners. Followers adhere to the articles of faith known as the five K's, of which one practice is to carry a comb at all times, as adherents are not permitted to cut their hair. For 10 points, name this Indian religion whose tenth and final guru was Gobind Singh and whose founder was Guru Nanak.
Output (English): Social Science