According to the World Health Organization (WHO), Vitamin A deficiency manifests in a progressive sequence of ocular signs. Arrange the following clinical stages of xerophthalmia in the correct order of increasing severity (from earliest to most advanced): 1. Bitot's spots 2. Night blindness (Nyctalopia) 3. Corneal ulceration/Keratomalacia 4. Conjunctival xerosis Select the correct sequence from the options given below:

Options:

• A: 1-2-4-3
• B: 2-1-4-3
• C: 2-4-1-3
• D: 4-2-1-3

Related Practice Questions:

• Let $S_1$ and $S_2$ be two disjoint, non-empty convex sets in $\mathbb{R}^n$. Under which of the following conditions is there guaranteed to exist a hyperplane that strictly separates $S_1$ and $S_2$?
• Let the primal linear programming problem be: Maximize $Z = c^T x$ subject to $Ax \le b, x \ge 0$. If this primal problem has an unbounded optimal objective value, then which of the following statements is always true regarding its dual problem?
• Let $S = \{(x, y) \in \mathbb{R}^2 \mid x^2 + y^2 \le 9\}$ be a convex set in $\mathbb{R}^2$. The set of all extreme points of $S$ is given by:
• In a linear programming problem with $3$ independent equality constraints and $5$ variables (including slack/surplus variables), what is the maximum possible number of basic solutions?