WHAT IS COMMON TO FOURTH (4 -th) TYPE OF AN ALLERGIC REACTIONS? Bbl6epuTe OLNH WTH HecKonbKO OTBeTOB: a. Sensitizec IT lymphocytes play a leading I role in the pathogenesis b. Start in 6-8 hours c. Start in 20-30 minutes d. The mechanism of development depends ; on lymphokines e. The mechanism of

The correct answer is:<br /><br />a. Sensitized T lymphocytes play a leading role in the pathogenesis.<br /><br />Explanation:<br />In the fourth type of allergic reactions, known as delayed-type hypersensitivity (DTH), sensitized T lymphocytes play a crucial role in the pathogenesis. This type of reaction typically takes 48-72 hours to develop after exposure to the allergen. The mechanism involves the activation of T cells, which then release cytokines that recruit macrophages and other inflammatory cells to the site of the allergen. This leads to tissue damage and the characteristic signs of a delayed-type hypersensitivity reaction.