Correct Option (b):
The correct match is A-2, B-1, C-4, D-3.
- Vitamin (A) is matched with Carotene (2). Carotenes are precursors to Vitamin A (retinol), an essential nutrient involved in vision, immune function, and cell growth.
- Enzyme (B) is matched with Pepsin (1). Pepsin is a proteolytic enzyme secreted in the stomach, responsible for initiating protein digestion by breaking them into smaller peptides.
- Hormone (C) is matched with Progesterone (4). Progesterone is a steroid hormone primarily produced by the corpus luteum in the ovary, playing a crucial role in the menstrual cycle, pregnancy, and embryonic development.
- Protein (D) is matched with Keratin (3). Keratin is a fibrous structural protein that forms the primary component of hair, nails, and the outer layer of the skin, providing strength and protection.
Incorrect Options:
- Option (a) 1234 is incorrect as it contains multiple mismatches. For instance, Pepsin is an enzyme, not a vitamin, and Keratin is a protein, not a hormone.
- Option (c) 2134 is incorrect because it misidentifies Keratin (3) as a hormone (C) and Progesterone (4) as a protein (D). Keratin is a protein, and Progesterone is a hormone.
- Option (d) 1243 is incorrect as it incorrectly matches Pepsin (1) with Vitamin (A) and Carotene (2) with Enzyme (B). Pepsin is an enzyme, and Carotene is a vitamin precursor.