It is the Spirit of Truth. Since very few people know Greek, they are unable to know if the arguments are true or not. In Greek and English, words are either masculine, feminine or neuter. The Watchtower states that since the Bible uses neuter pronouns to describe the Holy Spirit, He must be an it and not a He. However, the neuter in Greek does not imply personhood or non-personhood.
Demons are persons, though the Greek word is neuter.
Also, the Greek word for child is neuter. In Greek, the personal pronoun must match the gender of the object it is referring to. Therefore, the Holy Spirit has neuter pronouns. Even if the above was not true, at times, the Bible does use masculine personal pronouns for the Holy Spirit. This may seem to conflict with the rule given above about the pronoun agreeing in gender with the noun.