A. Chemists mostly don't stock it: only a few government hospitals do but in limited quantities. B. Delhi's building boom is creating a bizarre problem: snakes are increasingly biting people as they emerge from their disturbed underground homes. C. There isn't enough anti-snake serum, largely because there is no centralised agency that distributes the product. D. If things don't improve, more people could face paralysis, and even death.
Explanation:
B introduces the problem of snakes, C states why there is not enough anti-snake serum, A elaborates on non-availability of the same, and D concludes the passage by stating what the final outcome could be.
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