The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
All cells of connective tissue except blood secrete fibres. Fibroblasts
are the main cells of connective tissue, which secrete various types of
fibres. There are three types of fibres secreted by connective tissue
cells and each type is formed by proteins. these are collagen fibres
(made up of collagen protein), elastic fibres (formed of elastin) and
reticular fibres (made up of reticulin). All provide strength,
elasticity and flexibility to the connective tissue. So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.