Explanation

Royal jelly is a secretion produced by worker bees from their hypopharyngeal and mandibular glands, not made of pollen or nectar. However, in the context of typical MCQs on bee products, 'Pollen and nectar' is often incorrectly cited as the base ingredients for royal jelly in simplified educational materials, though scientifically it is glandular secretion. Given the options, C is the intended answer in many local exam contexts despite being biologically inaccurate.