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Restate the question in your own words, predict the answer before checking the options, and confirm that the explanation and correct-option field both point to Vitamin D.
Therefore option C, Vitamin D, is factually consistent with the stem, the marked correct index, and the explanation.✅ Correct Answer: C — Vitamin D Vitamin D (specifically its active form Calcitriol) is essential for calcium absorption from the intestine into the bloodstream. Without adequate Vitamin D, the intestine cannot absorb sufficient calcium, leading to low blood calcium levels, which causes Rickets in children (soft bones) and Osteomalacia/Osteoporosis in adults. Vitamin D is synthesized in skin when exposed to sunlight (UV rays). Vitamin A — Vitamin A is essential for vision (rhodopsin production), skin health, and immune function; not for calcium absorption. Vitamin B12 — Vitamin B12 is important for red blood cell formation and nervous system function; not for calcium absorption. Vitamin E — Vitamin E is an antioxidant that protects cell membranes; not for calcium absorption. 📝 Important Note: Vitamin D = 'Sunshine Vitamin' synthesized by skin from sunlight. Vitamin D deficiency = Rickets (children), Osteomalacia (adults). Calcium absorption requires Vitamin D. SSC CGL frequently tests vitamin-deficiency diseases.
FAQ
Common questions and clear answers for this topic.
The digestive, circulatory, nervous, and skeletal systems appear most frequently, along with sensory organs and basic endocrine functions.
Yes, the human body has 206 bones, and questions about the largest, smallest, and total bone count appear fairly often.
Questions usually cover blood group compatibility, the role of platelets in clotting, and basic facts about blood pressure and heart function.
No, most questions focus on what each organ does and why, rather than the detailed biochemical processes behind it.
Linking facts to real-life observations, like why pulse is checked at the wrist, makes them easier to recall than memorizing textbook lines.
