Antigen-presenting cells provide peptide–MHC complexes and appropriate activation signals to T cells, making P true. Class II MHC presents peptides to CD4 helper T cells, so the negative statement Q is false. Dendritic cells are professional antigen-presenting cells, making R true. Therefore A.
More Immunology: MHC, antigen processing and presentation, regulation, tolerance, hypersensitivity, autoimmunity, immunodeficiency, graft vs host disease, vaccines questions
GATE 2025 BT Q39– Correctly match the type of Hypersensitivity reaction with its respective Example.…
GATE 2023 BT Q16– Which one of the following drugs is NOT an immune checkpoint inhibitor?
GATE 2023 BT Q17– Dendritic cells are involved in cross-presentation of antigens. Which of the following…
GATE 2023 BT Q36– Match the immune tolerance mechanisms in Group I with their respective outcomes in Group…
GATE 2021 BT Q39– Match P Hashimoto’s disease, Q juvenile diabetes, R multiple sclerosis and S myasthenia…
GATE 2021 BT Q40– Match P type I, Q type II, R type III and S type IV hypersensitivity to: 1…